1. Data Utilization Reset

2. X X X X X Aphelion X X X X X X X Change data utilization to 0 % full
Review survey
data
Downlink data
Uplink commands
To transfer selected
data Ka Ka Ka Ka Ka Ka X X X X X
Orbit 6
Encounter
Aphelion X X X
Transfer selected
data from I-SSRs to
S/C SSR X Ka X Ka Ka Ka Ka Ka Ka X X Ka
Instrument
Encounter Prep
Downlink data
Change data
utilization
to 0 % full

3. Note that while reset of utilization to 0% occurs prior to encounter before perihelion, the increment of orbit number occurs at aphelion. Orbit number is for Ops an planning purposes, and is not known by or used by flight S/W
Flight S/W manages 2 orbits of data volume on the SSR
One SSR orbit “buffer” can be in the process of downlink completion while the 2nd orbit “buffer” is set to 0% full in preparation for the next data collection

4. For one instrument (Data is Fictitious)
Utilization
% Full
Maximum
Instrument
Volume
100 % E E
2nd Orbit
Maximum
SSR
Volume
One
Instrument
1st Orbit
Maximum E E
Ka Band
Volume KA KA KA E KA E
Encounter
Data Utilization Reset