RE: Origin of DMSP 1.9-second flashes, part 2

Jeff Kosecki (jkosecki@vvm.com)
Sun, 7 Sep 1997 21:42:08 -0500

hi, i saw your response to this flash question.  I saw the cosmos 22286 =
tonight and it flashed every two seconds as well.  does this have the =
same sensor package on it as well
22286 Cosmos 2228    6.0 2.0     7.7 3.8   3.5
 9 22 37   .0 59 184     0  3.4   4 8  406  96  466 2.1  63 1852  -1.0
 9 23 29   .0 89 100 C 275  3.1   4 8  405 114  405 2.3  68 19 5  30.0

jeff

----------
From: 	Ed Cannon[SMTP:ecannon@mail.utexas.edu]
Sent: 	Saturday, September 06, 1997 3:28 PM
To: 	SeeSat-D@cds.plasma.mpe-garching.mpg.de
Subject: 	Origin of DMSP 1.9-second flashes, part 2

Pardon me for sending two messages on this, but I just found this, and =
it
has more detail:

   http://eosdis.larc.nasa.gov:12000/sensor_documents/ssmi_sensor.html

> 3. Instrument Layout, Design, and Measurement Geometry:
>
>     List of Sensors:
>
>          Passive Microwave Radiometer=20
>
>     Sensor Descriptions:
...
> The SSM/I rotates continuously about an axis parallel to the local =
spacecraft=20
> vertical at 31.6 rpm ....  The scan direction is from the left to the =
right=20
> when looking in the forward (F10,F11) or aft(F8) direction of the =
spacecraft=20
> with the active scene measurements lying 151.2 deg about the forward
(F10,F11)=20
> or aft (F8) direction. This results in a swath width of approximately =
1400
km.=20
> The spin rate provides a period of 1.9 sec during which the spacecraft =
sub-
> satellite point travels 12.5 km.=20

Slight discrepancy -- this says 31.6 rpm (1.8987 sec/rotation), while =
the other=20
document said 31.9 (1.8807 sec).  I presume that one of them is a typo.

Ed Cannon
Austin, Texas, USA
30.3086N, 97.7279W, 165m