TM figures
| Allocated TM | 20.5 kbits/s | = 20.02 kibits/s | |
|---|---|---|---|
| Download capacity per orbit | 6.642 GB | = 49.49 Gibits | = 6334.3 MiB |
Subtelescopes
PHI has 2 telescopes but these use the same detector so at each moment in time only 1 of the telescopes can observe and generate data!
| wavelength | detector size | FOV | Vol/raw dataset | TM/processed image | |
|---|---|---|---|---|---|
| FDT | 617.3nm line (measured at 5 wavelengths + continuum) | 2048 px * 2048 px | 2ºx2º | 288 MiB | 2.5 MiB |
| HRT | 617.3nm line (measured at 5 wavelengths + continuum) | 2048 px * 2048 px | 16.8'x16.8' | 288 MiB | 2.5 MiB |
Observational modes
source: PHI IUM Iss3.4
For PHI there is only 1 data acquisition mode for each telescope. However, the data processing onboard differs in the following 'observing modes':
Warning!
PHI modes have recently been updated!
| Observing mode (=processing options) | Use Case | Telescope | Size | Cadence | Data Rate | Typical duration |
|---|---|---|---|---|---|---|
| (pixels) | (min) | (kbits/s) | (restricted by TM alloc.) | |||
| PHI nominal observation mode | FDT/HRT | 512-2048 | 1-60 | 1.7 - 1607.8 | hours - few days | |
| all 5 physical quantities | ||||||
PHI vector observation mode vector magnetic field (only) | FDT/HRT | 512-2048 | 1-60 | 0.9 - 908.8 | hours - days | |
PHI magnetograph observation mode 3 quantities: I_c, v_LOS, B_LOS | FDT/HRT | 512-2048 | 1-60 | 1.1 - 1048.6 | hours - days | |
| PHI_globalseismology_FDT_3 | PHI mode for global seismology (I_c + v_LOS) | FDT | 128-512 | 1 | 2.2 - 35 | long periods (+100 days) |
| PHI_localseismology_HRT_3 | PHI mode for local seismology (I_c + v_LOS) | HRT | 128-512 | 1 | days | |
( SYNOPTIC MODE) | PHI synoptic mode all 5 physical quantities | FDT only | 1024 | 240-1440 1-4 / day | 0.24 - 1.5 | unlimited |
| PHI_burst_5 | PHI burst mode triggered by STIX I_c only (TBC!) | HRT only | 2048 (TBC) | 1s (TBC) | 20971 | mins - hours (triggered) |
| 24 raw images, lossy compressed | FDT/HRT | 512-2048 | 1-60 | 7 - 6717.4 (3-48MiB/set) | hours |
To play around with parameters and the corresponding resource usage, see ObservationDataRateCalculator.xlsx
LowLatency or Pre-RSW programs
source: PHI IUM Iss3.4, table 17
| Observing mode | Use Case | Telescope | Data Volume |
|---|---|---|---|
| Full sun continuum + magnetogram (1024x1024) | FDT or HRT | ~1 MiB/set | |
| PHI Calibration set | full calibration set, before each RSW (incl FDT flatfielding) | FDT and HRT | ~4 MiB/set |