A POSSIBLE NATIONAL SPACE WEATHER STUDY EVENT

Basic Event Description:

There is evidence of 27 day recurring high speed stream activity. Solar imagery shows evidence of a CME late on 31 Oct 93 which may also play a role in the event. The shock associated with the event impacted the magnetosphere early on 3 Nov 1993. A high density feature within the stream caused major ionospheric and magnetospheric response shortly after 2300 UT on 3 Nov 93. A Storm Sudden Commencement has been identified in the World Data Center event listing. Shortly after 2300 UT on 3 Nov 93 sudden increases in solar wind velocity and density were recorded at IMP-8. The Ap maximum for the event was 78 and the DST minimum was -105.

Preliminary Geophysical Results:

DMSP ion drift data clearly show the convection enhancement associated with the event. The SAMPEX magnetospheric satellite indicated flux dropouts at L > 4 accompanied by energetic particle population enhancements at or near L=2. The Millstone Hill Radar saw the ionosphere's F region lift at L < 4 by nearly 100 km for a short time.

Possible Data Sources to Support This Study:

On a preliminary basis we know that IMP-8, SAMPEX and GEOTAIL have some supporting data. Three DMSP satellites with orbits near 840 km have ion drift meter and retarding potential analyzer data (and are likely to have particle data). Millstone Hill Radar was taking data (although this was not a designated World Day). Three Ionospheric Tomography chains were also operating during the event. The NOAA-12 and FREJA satellites were operating (data quality and availability are to be determined). GOES Geo-Synchronous data are available. Data from Los Alamos National Lab Geosynchronous satellites are available. Some optical data were taken at very high latitudes. Solar data include: YOKOH imagery, solar chronographs, H-alpha images, white light images, and radio heliographs.

We are looking for ways to make this a truly large-scale study event, possibly modeling all the way from the Sun down to the thermosphere and thereby involving the solar and CEDAR communities as well. The goals would be to explore what other observations are available and to assess the usefulness of this event as an example or test case for magnetospheric modeling.

If you wish to be a participant in this study in terms of data provision or modeling please contact either Delores Knipp at knipp@ncar.ucar.edu or the CEDAR Storm Study Representative: Michael Buonsanto at mjb@oceanus.haystack.edu.

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