PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = {"CO-V/E/J/S/SS-RPWS-4-SUMM-KEY60S-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-ALL-V1.0", "CO-V/E/J/S/SS-RPWS-3-RDR-LRFULL-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-WBRFULL-V1.0", "CO-V/E/J/S/SS-RPWS-2-REFDR-WFRFULL-V1.0"} PRODUCT_ID = "C30_TRIG_76" PRODUCT_VERSION_ID = "1.00" PRODUCT_TYPE = ANCILLARY INSTRUMENT_HOST_NAME = "CASSINI ORBITER" INSTRUMENT_HOST_ID = CO INSTRUMENT_NAME = "RADIO AND PLASMA WAVE SCIENCE" INSTRUMENT_ID = RPWS OBJECT = TEXT PUBLICATION_DATE = 2005-01-27 NOTE = " TRIG_76.TXT describes the RPWS instrument configuration for the High Frequency Receiver (HFR), the Medium Frequency Receiver (MFR), the Low Frequency Receiver (LFR), the Waveform Receiver (WFR), the Wideband Receiver (WBR), the Langmuir Probe (LP), the Sounder, and the onboard Dust detection algorithm when using Trigger 76." END_OBJECT = TEXT END Trigger 76 Description Sequence: C21, etc. Trigger 76 ( Titan low-rate Langmuir Probe Mode ) This mode is designed to provide a survey mode, with standard temporal resolution and spectral resolution, and with increased Langmuir Probe measurements designed for Titan flybys. High-frequency WFR measurements are made. Langmuir Probe sweeps are performed every 16 seconds using the down-up ramp bias function. Between the 1-second sweeps, 20-Hz LP density measurements are done. No Sounder or Dust measurements are made. The HFR is in Composite Mode Survey. During Cruise, this mode has been used periodically to monitor Spacecraft potential and photoelectrons. Receiver Frequency Range Sensors Time between Snapshots -------- ---------------- -------------- ---------------------- LFR 1 - 25 Hz EX, BX 32 seconds MFR 25 - 12 KHz EX, BZ 32 seconds WFR 0.1 - 2.5 KHz EX,EW,BX,BY,BZ 320 seconds HFR 3.6 KHz - 16 MHz EX, EW 10.375 seconds LP N/A Langmuir Probe 16 seconds The HFR is in a modified "Composite Survey" mode, which now includes both auto- and cross-correlations for H1. Prior to C28, this mode did not include auto-correlations for H1. This mode is defined by: Correlations Channels Integ. Size Frequency Band Ant. Auto- Cross- per Band df Period Rep Steps kHz Start - Stop ---- ---- ----- ------ -------- -- ------ --- ----- ---- ------------ ABC 2E y y 16 n 1000 1 3.6-319 kHz H1 2E y y 2 n 80 1 60 25 325k-1.8MHz H2 1E n n 1 n 20 1 72 200 1.8M-16MHz Bands ABC require 3.16 sec to complete, H1 requires 5.47 sec, and H2 requires 1.46 sec for a total of 10.09 sec per sweep. However, a small amount of additional time is required for commanding and data formatting, resulting in a 10.375 cycle time.