Trigger 92 Description
Sequence: C29
Trigger 92 ( Aurora/SKR Mode, inside source region )
This mode is designed to provide a survey mode with DF-2 (direction-finding with 2 antennas), and
additionally provide high frequency & time resolution for a narrow band in the SKR frequency
region to resolve fine structure.
Both low and high frequency WFR measurements are made. In high-frequency
mode, there are 512 samples taken for the EX and EW antennas. These
channels are also analyzed onboard using the LFDR FFT software, and the
LFDR data is provided in addition to the waveform data. In low-frequency
mode, 5-channel 2048-sample WFR measurements are made every 32 seconds.
Langmuir Probe sweeps are performed every 32 seconds; density measurements
are made at a 100-Hz sampling rate to match the Low-Frequency WFR measurements.
A simple up-going ramp sweep is performed; with a future software update,
this will become a down-going voltage ramp.
For C29, the Sounder measurements have been deleted.
| Receiver |
Frequency Range |
Sensors |
Time between Snapshots |
| LFR |
0.1 - 2.5 KHz |
EX, EW |
160 seconds |
| MFR |
25 - 12 KHz |
EX, BZ |
32 seconds |
| WFR(LF) |
1 - 25 Hz |
EX,EW,BX,BY,BZ |
32 seconds |
| WFR(HF) |
0.1 - 2.5 KHz |
EX,EW |
160 seconds |
| HFR |
3.6 KHz - 16 MHz |
EX, EW |
11.875 seconds |
| LP |
N/A |
Langmuir Probe |
32 seconds |
The HFR is in SKR mode, with freeze mode for H1. The freeze frequency
is by default 325 KHz, but this can be tweaked.
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 125 1 3.6-319 kHz
H1 2E y y 8 n 20 100 1 0 325k
H2 2E y y 1 n 20 1 315 50 325kHz-16MHz
Bands ABC require 0.395 sec to complete, H1 requires 2.74 sec, and H2 requires 8.25 sec
for a total of 11.39 sec per sweep. However, the time between analyses is 11.875
seconds.