Date: Wed, 21 Nov 2001 09:24:50 -0800 (PST)
From: "John Sexton" <computernetworks@go.com>
Subject: Re: LF: IMAGE Satellite Experiment IMAGE Satellite Experiment
To: rsgb_lf_group@blacksheep.org
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Hi All,
Having gone to the trouble to find out when to listen for these transmissions, I thought I would share the results with those who might be interested to listen for the transmissions on VLF and perhaps on 130 kHz. Though whether we have any chance of hearing the latter in Europe I rather doubt.

Times when the IMAGE satellite starts to descend from 50 deg North (when VLF Tx turned on), within a Longitude range of +/- 30 degrees. (Sri if you are outside Europe, you will have to go to  http://sscweb.gsfc.nasa.gov/cgi-bin/sscweb/Locator.cgi and work it out for yourselves)

      Time           GEO     
yy/mm/dd hh:mm   Lat    Long 
01/11/21 21:14  50.25   -5.73
01/11/24 20:24  50.40    3.86
01/11/27 19:34  50.55   13.43
01/11/30 18:44  50.66   23.00

The VLF transmissions will be 0.125 seconds on, 0.375 seconds off, at 5, 7, 9, 11, 13, and 15 kHz, repeated over and over. 


Times of closest approach to South Pole. 4 mins before this the VLF Tx will be turned off and transmission will start on 130 and 380 kHz for 8 minutes.

yy/mm/dd	hh:mm
01/11/21	08:18
01/11/22	12:46
01/11/23	03:00
01/11/23	17:14
01/11/24	07:28
01/11/24	21:42
01/11/25	11:56
01/11/26	02:10
01/11/26	16:24
01/11/27	06:38
01/11/27	20:52
01/11/28	11:06
01/11/29	01:18
01/11/29	15:32
01/11/30	05:46
01/11/30	20:00
01/12/01	10:14
01/12/02	00:28
01/12/02	14:42
01/12/03	04:56
01/12/03	19:10
01/12/04	09:24
01/12/04	23:38
01/12/05	13:52

73, John, G4CNN


-----Original Message-----
From: "ARi"<Achim.Richart@t-online.de>
To: rsgb_lf_group@blacksheep.org
Date: Tue Nov 20 08:51:05 PST 2001
Subject: LF: IMAGE Satellite Experiment IMAGE Satellite Experiment

>Dear LF and Natural Radio Observers,>
>INSPIRE has arranged to perform experiments to test propagation to the ground from the Radio Plasma Imager 
>instrument on the IMAGE Satellite over two weeks starting on November 21, 2001. A table at the end gives the 
>times for the experiments.
>
>There will be two sets of experiments, at 5-15 kHz (VLF) and at 130 and 380 kHz. The 5-15 kHz experiments will be
>performed on the incoming (towards perigee), southward traveling part of every orbit, starting at about the point where
>the magnetic field line through the satellite is at about 50 degrees N latitude. They will continue until the the 130 and 
>380 kHz experiment begins. The 130 and 380 kHz transmissions will begin when the satellite is four minutes before the
>closest approach to the South Pole, and continue four minutes past closest approach.
>You could be prime observers for the VLF experiments!
>
>The VLF transmissions will be 0.125 seconds on, 0.375 seconds off, at 5, 7, 9, 11, 13, and 15 kHz, repeated over and
>over.
>
>Details of the satellite orbit, both graphical and tabular, may be found at the Satellite Situation Center web site:
>
>http://sscweb.gsfc.nasa.gov/cgi-bin/sscweb/Locator.cgi
>
>and
>
>http://www.lwca.org/mb/msg/1462.htm
>
>ARi.
>
>


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