Trigger 8A Description

Sequence: S05, ...
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 "toggle" mode. Dust detection is included. Langmuir Probe sweeps are performed every 640 seconds. A Sounder measurement is scheduled every 10 minutes. MFDR measurements are made every 32 seconds, which provides MFR2 replacement data, while the LFR measurements are also made every 32 seconds, providing the 25-Hz LFR data.

Beginning in S03, the HFR H2 configuration was modified, in order to improve the sensitivity for SEDs. The H2 integration period is increased to 40 ms, and the number of frequency steps is increased to 143, with the delta-f between steps decreased to 100 kHz.
Receiver Frequency Range Sensors Time between Snapshots
LFR 1 - 25 Hz EX, BX 32 seconds
MFDR 70 - 1700 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 600 seconds



The HFR is in the newest version of "Composite Survey" mode, which now includes both auto- and cross-correlations for H1, and changed parameters for H2. 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       32    n   1000  1              3.6-319KHz
HF1   2E    y     y        2    n     80  1     60    25 0.325-1.825MHz
HF2   1E    n     n        1    n     40  1    143   100 1.825-16.125MHz
Bands ABC require 3.160 sec to complete, H1 requires 5.473 sec, and H2 requires 5.034 sec for a total of 13.666 sec per sweep. The hfr cycle time is 16.000 seconds. Every 600 seconds the HFR normal analyses are interrupted by a Sounder analysis. Beginning in S05, the Sounder setup was modified. With the current configuration, the Sounder operation has a duration of approximately 16 seconds. This Sounder analysis is defined by:
  sounder mode:   EX AAA
  1st  sounder freq:      0
  last sounder freq:     89
  T1 delay:         5 msec
  T2 delay:         5 msec
  T3 delay:        15 msec
  passive spectra:      2
  active  spectra:      2
  # of cycles:       1
  sounder output A:      3 autos
  sounder output B:      3  AGCs