During bias sweeps, settings are updated too rapidly for each change to be telemetered in an individual packet, so the bias settings during the sweep are inferred based on FIELDS instrument command history. Packets are generated for each update to AEB settings, and periodically for monitoring purposes. Level 2 AEB dataĭuring normal operations, AEB housekeeping data are returned in telemetry packets. The preamp temperature increases near perihelion, as does the magnitude of the (negative) bias current applied to the whip. The plot panels show the temperature of the V1 preamplifier psp_fld_l2_aeb1_PA1_TEMP and the bias current applied to the V1 whip psp_fld_l2_aeb1_V1_WHIP_CURR. The plot below shows Level 2 AEB data from PSP Encounter 11. The Level 2 AEB files contain housekeeping data from both AEBs, including bias voltages and currents for each of the V1-V5 sensors, along with temperature information from the FIELDS preamplifiers and MEP. For details on AEB1 and AEB2, see the FIELDS instrument paper. AEB1 processes signals from the FIELDS V1, V2, and V5 sensors, while AEB2 processes V3 and V4. The FIELDS Main Electronics Package contains two Antenna Electronics Boards (AEB1 and AEB2), which are nearly functionally identical. Level 2 Antenna Electronics Board (AEB) data is now available. Times of anomalous bias conditions are indicated in the bottom panel, which shows the data quality flag variable. The third panel shows the V3 bias current. Anomalous bias interval during Encounter 11. A new data quality flag ANOM_BIAS has been created and is used to mark the time intervals when anomalous bias conditions are present. The cause for this out-of-family bias current is still under investigation. For two intervals during Encounter 11, the V3 bias current was set to a positive value which did not match the current on the other three antennas. The whip bias currents on the V1-V4 FIELDS antennas are typically set to matching negative values. The underlying commanding issue was identified and resolved, and RFS LFR data was successfully recorded during Encounter 12. RFS/HFR data was unaffected, except during short intervals near times of bias sweeps. There is no LFR data (and, therefore, no possibility of QTN data with electron density/temperature) during this gap, which lasted for approximately 4 days surrounding perihelion. Data Anomalies RFS/LFR Data Gapĭuring Encounter 11, a commanding error resulted in a gap in RFS/LFR data near perihelion, as shown in the figure below. The release notes below detail anomalies in the FIELDS data from Encounter 11, and new data products which are now publicly available (for the entire PSP mission, up to and including Encounter 11). Data was made publicly available on August 1, 2022. PSP/FIELDS Data Release 12 includes survey and select data from Encounter 11 (perihelion February 25, 2022).
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