Fine time resolution analysis of the 14 July 2000 GLE

Details Fine time resolution analysis of the 14 July 2000 GLE Fine time resolution analysis of the 14 July 2000 GLE

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3363d&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

4

Scientific paper

A Ground Level Enhancement occurred on 14 July 2000 and a significant response was observed by at least 18 stations in the world-wide neutron monitor network. Earliest onset was between 10.30 and 10.35 UT at several stations. Analysis of the enhancement using the established technique described by Cramp et al. (1997) has been undertaken for every 5-minute interval from 10.30 UT to 20.00 UT using data from 25 stations (including some with no significant enhancement). The spectrum was fitted with a simple power law and initially had a slope of around -6, softening during the event to around -9. At onset the particle arrival was quite anisotropic but tended toward increasing isotropy for an hour or more. Later in the event, when only low energy protons remained, the pitch angle distribution became highly anisotropic again. The apparent "arrival direction" of the particles also changed markedly between 11.00 and 11.10 UT but varied more slowly before and after that transition.

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