Trigger 90 Description

Sequence: C15, C16
Trigger 90 (Magnetotail Basic Survey)
This mode is designed to provide a Survey with standard temporal resolution and standard spectral resolution for periods following Earth Swing-by when in the magnetotail. Periodic Waveform measurements are made at a higher rate. The entire RPWS frequency range (1 Hz - 16 MHz) is covered. The target bit rate is 2 kbps.

Receiver	Frequency Range	Sensors	Time between Snapshots
LFR	1 - 25 Hz	EX, BX	16 seconds
MFR	25 - 12 KHz	EX, BZ	32 seconds
WFR	.1 - 2.5 KHz	EX, EW, BX, BY, BZ	96 seconds
HFR	3.6 KHz - 16 MHz	EX, EW	9.875 seconds

The HFR is in CMS mode (Composite Mode Survey). No direction-finding is done. 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   n         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 5.05 sec, and H2 requires 1.46 sec for a total of 9.67 sec per sweep. Data collection and output limits the snapshot time to 9.875 seconds.