Trigger 8A Description
Sequence: C27, C30, C31, etc.
Trigger 8A ( Survey Mode, All Regions )
This mode is designed to provide a survey mode, with standard temporal resolution and spectral resolution.
Both low-frequency and high-frequency WFR measurements are made, using a "toggle" mode, although
a fixed gain (maximum) rather than an auto gain mode is required until a future software update.
Dust detection is included. Langmuir Probe sweeps are performed every 640 seconds. A Sounder measurement
replaces the HFR analyses every 640 seconds.
| Receiver |
Frequency Range |
Sensors |
Time between Snapshots |
| LFR |
1 - 25 Hz |
EX, BX |
32 seconds |
| MFR |
25 - 12 KHz |
EX, BZ |
32 seconds |
| WFR |
1 - 25 Hz |
EX,EW,BX,BY,BZ |
320 seconds |
| WFR |
.1 - 2.5 KHz |
EX,EW,BX,BY,BZ |
320 seconds |
| HFR |
3.6 KHz - 16 MHz |
EX, EW |
16 seconds |
| LP |
N/A |
Langmuir Probe |
640 seconds |
| Sounder |
3.6 - 115 KHz |
EX, EW |
640 seconds |
The HFR is in a modified "Composite Survey" mode, which now includes
both auto- and cross-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, the time between analyses is set to 16
seconds to reduce the bit rate, and also to synchronize with the 640-second sounder
operations.
Every 640 seconds the HFR normal analyses are replaced by a Sounder analysis.
The Sounder operation has a duration of approximately 40 seconds.
This Sounder analysis is defined by:
sounder mode: EZ AAA
1st sounder freq: 0
last sounder freq: 89
T1 delay: 10 msec
T2 delay: 25 msec
T3 delay: 25 msec
passive spectra: 2
active spectra: 2
# of cycles: 1
sounder output A: 3 autos
sounder output B: 3 AGCs