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Plots are in GSE (geocentric solar ecliptic) coordinates, so Earth is at [0,0], the Sun is at [1,0]. The plot is the projection of the orbit on the ecliptic plane.

6th orbit & part of 7th orbit in NMP: 4 RS windows, first S and N windows reach max latitude 13º, last S window reaches 21º already.

RS window (default) placement

EXT Start
Safe Mode Comms Blackout

Largest Comms Roll

GAM Restrictions
MTP 10South2023-07-132023-07-172023 07-270.650.590.53-12.86-13.07-12.83166162155NONO00NO
MTP 10Perihelion2023-08-092023-08-132023-08-230.320.300.32-02.6406.7112.00100 070038NONO00 NO
MTP 10NorthN/A2023-08-232023-09-020.320.370.4312.0013.0111.74038014002NONO00YES
MTP 10VGAM 5N/A2023-09-28              
MTP 10South2023-12-112023-12-152023-12-250.580.510.45-20.95-21.32-20.47038045055NONO00NO

MTP10-North placement conflicts with VGAM5

Proposal RS window placement

  • Move concatenated perihelion and North window earlier by ~5 days to avoid GAM. This will slightly decrease the downlink rates for these windows, but as we are moving towards Earth, SSMM can be filled up and all TM can be dumped right after the first 3 RSwindows.
  • First South window can potentially be moved for better TM if we want to sacrifice the moderate latitude (13º).
    Potentially we could move the 3 RSWs together to make 1 concatenated window : this could be helpful for L_FULL_LRES_MCAD_Coronal-Synoptic SOOP and R_FULL_HRES_HCAD_Density-Fluctuations (which has a short duration ~8hrs)
  • To check feasibility of this option, we should simulate what happens if 
    • we give more TM downlink share to IS payload during early MTP09
    • let RS produce a lot of TM during MTP09 RSwindows (and store onboard)
    • lower the TM downlink share to IS payload during the bad comms period overlapping MTP09 and MTP10 = April-June 2023 (EPD may be in far mode anyway for last part of that period)
    • let all payload produce at regular or better rates during the first 3 MTP10 RSwindows
  • If we care more about latitude than solar distance during the 2nd south window, it could potentially be moved earlier to gain TM. May help moving into MTP11 which has very bad TM constraints.

Planning proposal

I_DEFAULT outside of RSwindows, L_IS_STIX on inside all RSwindows

Modelled in SAP v0:

I_DEFAULT outside of RSwindows, L_IS_STIX on inside all RSwindows

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