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.