TM figures
| Allocated TM | 20.5 kbits/s | |
|---|
| Download capacity per orbit | 6.642 GB | = 53.136Gbits |
|---|
Subtelescopes/units that can be commanded independently
SoloHI consists of 1 white-light telescope with wide FOV. The image is captured on a mosaic of four 2048x1920 APS detectors that are read out independently. This gives flexibility for image operations: independent exposures, cadences, etc.). Data can be read out either from the whole detector or from selected subfields.
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.
| | FOV split (radial x transverse) | Downlinked pixels | Typical cadence | Comments |
|---|
SoloHI Full frame image
(40ºx40º) | 5º to 45º x 40º 
| 1960 px * 1960 px
(incl. 2x2 bin) | 24-36 min (inner FOV)
30-72 min (outer FOV) | split in 2 or 3 readout frames depending on solar distance,
e.g. 5º to 25º x 40º (inner) + 25º to 45º x 40º (outer) at perihelion,
each with different cadence. Details in table below. |
|---|
SoloHI inner FOV subframe images
(3 images of 1.88ºx5º) | 5.8º to 7.68º x 5º
13.5º to 15.38º x 5º
18.5º to 20.38º x 5º | 192 px * 512 px (not binned)
96 px * 256 px (binned 2x2)
96 px * 256 px (binned 2x2) | 18-36 sec
36-72 sec
1.5-3.0 min | Subframe images typically only used at and near perihelion (up to 0.36AU) |
|---|
Radial Swath subframe image
(40ºx5º) | 5º to 25º x 5º
25º to 45º x 5º | 1960 px * 256 px
(incl. 2x2 bin) | 6 min (inner FOV)
12 min (outer FOV) | Radial swath images typically only used at and near perihelion (up to 0.36AU) |
|---|
Observational modes
Main science programs
source: SoloHI UM - SSD-DOC-SOLOHI-013 Rev. B draft 5
The SoloHI baseline observing program will be defined to repeat for each occurrence of the same unique orbit (i.e. each orbit of the trajectory within the same resonance with Venus). Therefore, a SoloHI baseline observing program will be defined for each orbit phase in NMP/EMP and will be executed for all orbits within that resonance.
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 @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
Examples of more-detailed observing program for 1 type of orbit during the mission:
+ SoloHI concept study report Dec 2011