archive: SETI [ASTRO] Middle Latitude Auroral Activity Watch being Issued

SETI [ASTRO] Middle Latitude Auroral Activity Watch being Issued

Larry Klaes ( )
Wed, 05 May 1999 07:43:27 -0400

>X-Authentication-Warning: majordom set sender
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>Date: Wed, 5 May 1999 08:02:42 -0300 (ADT)
>From: Michael Boschat <andromed@ATM.DAL.CA>
>X-Sender: andromed@Sleet
>To: ASTRO <>
>Subject: [ASTRO] Middle Latitude Auroral Activity Watch being Issued
>Reply-To: Michael Boschat <andromed@ATM.DAL.CA>
>>From Solar Terrestrial Dispatch - Alberta - Canada
> Middle Latitude Auroral Activity Watch being Issued
>Auroral activity was quiet over the last 24 hours. Further analysis of
>yesterdays minor M-class proton flare suggests the impact of this
>disturbance could be mildly to moderately strong. We are expecting the
>arrival of the disturbance as early as 14:00 UTC on 05 May to as late as
>the mid part of the UTC day of 06 May. The uncertainty is due to
>difficulties in determining the ejection velocity of the disturbance from
>the Sun. At the present time, models suggest that auroral activity may
>begin intensifying fairly shortly after the shock-front of the disturbance
>reaches the Earth. The most intense phase of activity is expected to be
>the intial 6 to 12 hours following the arrival of the disturbance, so
>spotting activity may be difficult unless attention is paid to when the
>disturbance arrives. Timing will also be important, so that the peak of
>the activity occurs during the local night hours prior to moonrise. Users
>of our Ge+lert software should receive near-realtime notices of impending
>activity as soon as the disturbance arrives (if it arrives with an
>orientation that is favorable for producing activity). Activity should
>begin subsiding approximately 24 hours after the disturbance arrives at
>the Earth. This is not expected to be a particularly strong event, but may
>be worth monitoring during the peak hours of the disturbance.
> NOTE: High latitude stations are now experiencing adverse seasonal
> twilight conditions. Regular reports from the higher latitude stations
> will therefore cease until later this fall.
> ** End of Aurora Report **