Trigger 94 Description
Sequence: C15 (ESB)
Trigger 94 (ESB Langmuir Probe Checkout)
This mode is designed to test the Langmuir Probe and verify its proper
operation. For about 10 minutes the LP performs once-per-minute
down-up full-range sweeps, followed by 20-Hz density measurements for ~50 seconds.
The rest of the RPWS instrument continues to run in the mode defined by
Trigger 8C, although the WBR is paused for a second whenever a Langmuir Probe
sweep is performed. Thus, this mode provides a Survey with fast temporal resolution
and standard spectral resolution for periods during Earth Swing-by.
Fast Waveform measurements are made in the High-Band mode (0.1 - 2.5 KHz).
To achieve this elevated data rate, the low-frequency measurements on LFR are deleted.
Wideband Receiver measurements are made in the 10-KHz mode.
The RPWS frequency range covered is 23 Hz - 16 MHz.
Receiver |
Frequency Range |
Sensors |
Time between Snapshots |
MFR |
25 - 12 KHz |
EX, BZ |
32 seconds |
HFR |
3.6 KHz - 16 MHz |
EX, EW |
6.625 seconds |
WFR |
.01 - 2.5 KHz |
EX, EW, BX, BY, BZ |
20 seconds |
WBR |
.1 - 10 KHz |
EX |
0.375 second |
Langmuir Probe |
N/A |
Probe |
60 seconds |
The HFR is in SKR polarization mode, with no direction-finding.
Thus, measurements are made on the dipole EX and the monopole EW.
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 500 1 3.6-319 kHz
H1 2E y y 2 n 80 1 36 25 325k-1.2MHz
H2 2E y y 1 n 20 1 75 200 1.2M-16MHz
Bands ABC require 1.58 sec to complete, H1 requires 3.28 sec, and H2 requires 1.52 sec
for a total of 6.38 sec per sweep. In practice, the time between spectra is 6.625 sec.