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this presentation will address the

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flight operations plan for the orbiting

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solar laboratory

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osl it will describe utilization of the

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nasa ground system and control the

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observatory pointing

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from instrumental workstations during a

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typical

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science campaign the osl will be

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creating

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high-resolution motion pictures of the

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dynamic activities on the sun's surface

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and in the overlying chronosphere

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digitizing this data for real-time

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transmission to the ground requires a

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relatively

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high data rate of 16 megabits per second

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in comparison other solar imaging

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satellites like

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smm took still photos stored them on

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board and transmitted them later at

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about

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32 kilobits per second or less

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however the landsat satellites take even

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higher resolution still

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photos of the earth and transmit them in

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real time at 85 megabits per second

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but the total data required for landsat

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is lower than for osl

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because landsat takes individual scenes

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only

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while osl takes movies in both cases

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there is too much data for a nominal

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onboard storage device

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tdrs is the only way to get real-time

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data rate telemetry from a low

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polar orbiting satellite like landsat or

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osl

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tdrs must point its high gain antennas

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at these satellites

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whenever their science data is to be

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collected therefore

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availability of the tdrs single access k

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band ksa

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links will limit the amount of science

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data that osl

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transmits typically tdrs

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has authorized from four to eight hours

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per day

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on their ksa links as long as it's at

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their convenience

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for osl this is no problem since osl

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will see the sun

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100 percent of the time and we'll see at

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least one tdrs satellite

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97 percent of the time

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during these real-time telemetry

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sessions data from osl is received at

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the data capture facility

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dcf at the goddard space flight center

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all raw data is recorded on high density

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digital recorders it is processed to

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level zero and forwarded to the science

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operations facility

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sof in near enough real time

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because the osl is using nasa's standard

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telepathization formats and protocols

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the nasa communications network can

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easily handle it within their

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institutional ground system capabilities

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this data output from the dcf is easily

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converted into viewable movies

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by the instrument or workstations and

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the entire communications link is

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transparent

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in addition the dcf recorded data is

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eventually sent to the goddard science

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data processing facility

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for offline bulk data processing

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distribution to the scientists

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the project operations control center

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park

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located goddard will handle all flight

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operations

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this requires only an s-band link

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through tdrs

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during science data collection times a

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single access system is available but

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otherwise

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a low gain multiple access system is

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sufficient

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whenever osl is not collecting real-time

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science data

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the puck is responsible for routine

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maintenance and housekeeping

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it must ensure that the observatory

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stays pointing nominally at the sun

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to keep the solar arrays lit even when

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the scientists are controlling the

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observatory pointing

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the puck has inline control over any

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uplinked commands

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and it prevents any hazardous commands

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osl will be available for real-time

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science campaigns during nine months

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each year

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at pre-planned tdrs observation windows

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a typical campaign is planned by the

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scientists based on inputs from other

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solar observatories

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and requests from the osl scientists and

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the solar physics community

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the sof coordinates these inputs and

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dictates the campaign scenario

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it is possible to conduct retargeting

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and near real-time science data

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processing operations from the sof

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a typical science observation campaign

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first requires a course

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pointing of the osl to a new location on

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the sun

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the initial course pointing can be done

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with the

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low rate multiple access tdrs

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communications links

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before the high gain tdrs antennas are

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scheduled for osl

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in the sof the scientists have full

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sun images from ground-based

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observatories displayed

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on their workstations the yellow disk

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the real full sun image will indicate

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which local feature on the sun is

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currently being viewed by the osl

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and the location of the new feature to

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using a mouse the operator positions his

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display window over the new location

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and initiates a command to move the osl

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in addition the osl must be rotated

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to align the osl cameras properly for

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this feature

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this is also done by rotating the

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display window and initiating a command

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to the osl

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the poc must approve all commands before

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it uplinks them

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then the osl will begin to reorient

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itself as directed

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the only data received to verify this

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course pointing

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is found in the spacecraft housekeeping

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telemetry

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that is received through multiple access

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tdrs

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by the park now the scientists wait for

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the pre-scheduled tdrs high data rate

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link

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once tdrs points its high gain antenna

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towards osl

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the ongoing science data is relayed to

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the dcf and forwarded to the sof

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where it is viewed as a movie

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the workstation display is replaced by

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this near real-time osl data

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which is a very high-resolution blow-up

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of a small

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area on the sun within this blow-up the

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scientist can exactly locate the feature

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of interest

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and do the necessary fine pointing again

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he moves his display window across the

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image and rotates it as necessary

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he initiates the appropriate command

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request and the poc screens it and

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uplinks it if valid

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this time the image displayed on the

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workstation will

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update as the osl moves and the

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scientists can verify

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the new pointing in near enough real

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time

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once satisfied he can set the osl auto

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track system by another

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oso will now recognize the feature in

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its field of view

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and track it even as it changes and

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moves

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since there are no eclipses oso never

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loses the target

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and it will track it even after tdrs

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breaks contact

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hours or days later when tdrs resumes

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real-time science data

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the feature is still centered in the osl

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field of view and

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once again displayed on the workstation

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scientists are thus able to more easily

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interpolate the missing data

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because they know that this is the same

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feature

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in addition to auto tracking the osl has

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image

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stabilization systems on each of its

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instruments

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these systems remove any jitter in the

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data caused by random vibrations of the

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observatory

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that might be caused by the steerable

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antennas

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or the reaction wheels in the attitude

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control subsystem

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this capability is demonstrated by these

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before and after pictures taken of the

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sun

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using this image stabilization system at

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a ground-based

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observatory the jitter was introduced

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mechanically

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to simulate onboard vibrations of

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various frequencies

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and has been totally removed notice that

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the data quality is degraded

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by the atmospheric distortions as it is

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with all ground-based observations

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because of these state-of-the-art

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capabilities provided by the osl

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in this continuous sunlit orbit the

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scientist will also be able to conduct

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some near-real-time

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science data processing from his

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workstation as he views the data

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he can select various filters for

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example to emphasize the events of most

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interest and

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quickly evaluate his decision in this

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way

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he can ensure that the data being

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collected back at the dcf is

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just what he needs he also knows where

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in the raw database it will be and

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he can request only the essential data

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to be bulk

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processed offline this inherently will

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reduce the amount of bulk data

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processing required to produce

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a prescribed data product

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a number of types of science

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observations can be accomplished

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just as easily by this osl for example

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some dynamic solar processors require

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a quick look every so often and the data

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can be collected during

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short tdrs contacts other events require

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a continuous look for several hours to

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capture the entire process

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tdrs has assured at least a three hour

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science data contact

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every day to enable this type of science

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to be conducted

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the fact that the osl orbit provides 100

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percent continuous solar viewing

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is also critical to this type of science

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and the flexibility it provides greatly

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facilitates

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the use of tdrs with osl

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the solar physics community has an

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unprecedented opportunity to conduct

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solar

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dynamic science on a scale well beyond