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From: oler@rho.uleth.ca (Cary Oler)
Message-Id: <9311181711.AA06563@rho.uleth.ca>
Subject: WARNING: Potential Satellite Anomaly Warning
To: solar-daily@lut.fi
Date: Thu, 18 Nov 93 10:11:23 MST
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Status: RO

                    /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

                      POTENTIAL SATELLITE ANOMALY WARNING

                        ISSUED: 16:30 UT, 18 NOVEMBER

                    /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

     The following report is experimental.  We would like to solicit
     comments on the usefulness of satellite anomaly warning reports
     (specifically warning of geosynchronous magnetopause crossings).

ATTENTION:

     A sudden magnetic impulse of 16 nT marked the arrival of a disturbance
at 12:11 UTC on 18 November.  The field at geosynchronous altitudes was
jolted by approximately 22 nT, afterwhich generally active geomagnetic
conditions prevailed.  However, magnetospheric ram pressure has increased
over the last hour and is resulting in sufficient magnetospheric compression
to produce magnetopause crossings by geosynchronous satellites.  Both GOES-6
and GOES-7 have penetrated the magnetopause and are still within the
magnetosheath as of 16:30 UTC.

     Geosynchronous satellites may suffer additional magnetopause crossings
over the next 12 hours.


**  End of Warning  **


