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At the mini-SWT during SOWG13 SOC took the action to try and optimise the in situ data return for the cruise phase. Here we present the results of that optimisation, the optimised plan can be found on the SOOP Kitchen: MLP Feb 2020 as of SWT24.

The optimisation was carried out with the goal of minimising the amount of time that the instruments would have to operate with a reduced cadence or resolution of normal mode data, while maintaining a reasonable amount of burst mode and without filling the packet stores more than approximately 90%. Recall that selective downlink will be unavailable during the cruise.

The plan was constructed using only observations definitions that SOC are sure are accurate, i.e. no GENERIC type observations were used. Observations of duration 7 days were added to the plan as follows:

  1. Normal mode only at standard cadence and resolution throughout the cruise. This resulted in packet store overruns!
  2. Reduced cadence, "low rate" observations replace the default normal mode observations for periods subsequent to the first perihelion when the spacecraft was further than 0.8 AU from the Sun, apart from the end of cruise when the spacecraft will approach Earth.
  3. Some minutes per day of burst mode were added to each observation, commensurate with the default amount of burst mode for that observation type according to the observation definition.
  4. For RPW and MAG, an additional 8 hours of burst mode (EQUAL128 for MAG) per day were added during each of the Remote Sensing Checkout Windows to allow for detailed EMC characterisation of RS instrument operations.

The plan is then as follows:


The following observations were used, minutes per day of burst mode in brackets:
RateEPDMAGRPWSWA-EASSWA-PASSWA-HIS
Nominal (R<0.8)EPD_CLOSE_BURST (15)MAG_NORMAL_BURST (120)RPW_DEFAULT_COLD (10)SWA_EAS_NOMINAL_BURST (10)SWA_PAS_NORMAL7_BURST7 (5)SWA_HIS_NORMAL_BURST (5)
Low (R>0.8)EPD_FAR_BURST (5)MAG_LOW_BURST (30)RPW_LOW1_COLD (10)SWA_EAS_LOW_BURST (10)SWA_PAS_NORMAL11_BURST11 (5)SWA_HIS_LOW_BURST_HALF (5)

Note that for RPW and MAG different observations were used during RS Checkout Windows.


This results in the following output rates and packet store fill states:


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