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Typically, SoloHI images will have one of 3 typical FOVs defined below. These are used in the observing programs/modes currently defined but could be changed in-flight if necessary.
| detector size FOV split (radial x transverse) | FOV (radial x transverse) | TM/raw image | compression ratesDownlinked pixels | Typical cadence | Comments | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SoloHI Full frame image | 3968 (40ºx40º) | 5º to 45º x 40º | 1960 px * 3968 1960 px | 5º-45º x 5º-45º (40ºx40º) | info missing | lossless (factor 2.5) - lossy (up to 50)(incl. 2x2 bin) | 24-36 min (inner FOV) |
| |||
| SoloHI inner FOV subframe image | 192 px * 512 pximages (3 images of 1.88ºx5º) | 5.8º | -to 7.68º x 5º | (1.88ºx5º)
| -to 15.38º x 5º | -to 20.38º x 5º | 192 px * 512 px (not binned) | 18-36 sec | Subframe images typically only used at and near perihelion (up to 0.36AU) | ||
| Radial Swath subframe image | 3968 px * 512 px | 5º-45º x 5º (40ºx5º) | (40ºx5º) | 5º to 25º x 5º 25º to 45º x 5º | 1960 px * 256 px | 6 min (inner FOV) | Radial swath images typically only used at and near perihelion (up to 0.36AU) |
Observational modes
Main science programs
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Example of such an orbit plan is below:
The details of each observing mode are still to be provided by SoloHI.
| Observing modes - Example plan | Use case | #images / day | Science data volume / day | SoloHI data rate | Observing duration / orbit | |
|---|---|---|---|---|---|---|
| (Gbits) estimate | (kbits/s) | (days) example | ||||
| Perihelion programs: | 0.28-0.29 AU | |||||
SoloHI Solar Wind Turbulence @perih | 1296 | 2.22 | 26.5 | 3 | ||
SoloHI Shock Formation @perihFormation @perih |
| 468 | 2.54 | 30.3 | 3 | |
| Near-Perihelion programs: | 0.29-0.36 AU | |||||
| SoloHI Near-perihelion Synoptic Program | 348 | 1.69 | 20.3 | 5 | ||
| SoloHI Solar Wind Turbulence Near-perihelion | 750 | 1.94 | 23.2 | 2 | ||
| SoloHI Shock Formation Near-perihelion | 516 | 2.45 | 29.3 | 2 | ||
| Far-Perihelion programs: | 0.36-0.42 AU | |||||
| SoloHI Far-Perihelion Synoptic Program | 132 | 1.64 | 19.7 | 7 | ||
Southern  Out-of-ecliptic programs: | 0.5-0.7 AU | |||||
| SoloHI Southern Synoptic Program | 104 | 0.84 | 10.3 | 8 |
Dependent on the trajectory
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Examples of more-detailed observing program for 1 type of orbit during the mission (source: 04_130904_SoloHI_CDR_ObsProg.ppt):
Based on table above:
- a typical perihelion programme would produce ~25kbps (during 4 days), -> see modelled observations HI_SHOCK_PER (DATARATE=30300 [bits/sec]), HI_TURB_PER (DATARATE=26500 [bits/sec]),
- near-perihelion SoloHI would produce ~20kbps (during 8 days) , -> see modelled observation HI_SYN_PER (DATARATE=20300 [bits/sec])
- ~18.5kbps even further out (during 12 days) and -> see modelled observations HI_SYN_NEAR (DATARATE=19700 [bits/sec])
- in the far-out RSwindow, a datarate around 10 kbps would be reached. -> see modelled observations HI_SYN_FAR (DATARATE=10300 [bits/sec])
(see also SoloHI concept study report Dec 2011, needs update! )
How to organize SoloHI observations in coordination with the other instruments, i.e. does SoloHI have 'observing modes' to choose from for each solar distance?, is still to be discussed in more detail. Also, while the schema above may be optimal from a science perspective, the varying downlink rate & SSMM storage limits may impose limitations on when which datarate can be used.