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The first two proton flares in the onset of solar cycle 23
M. A. Mosalam SHALTOUT
The onset of the solar cycle 23 started by two solar proton flares at 4
and 6 November 1997 from the Active region SESC 8100. The GOES spacecraft
detected protons of flux 72 and 492 pfu (Particle Flux Unit) of energies
> 10 MeV at 4 and 6 November 1997. The two proton flares were associated
with flares of X-ray importance X2 and X9 and H-alpha importance 2B on
Nov 4 and 6 respectively. An evaluation of the solar active region 8100
was performed and conclusion about the proton events was drawn through
the onset of solar cycle 23. The proton flares produced high sudden ionospheric
disturbance (SID) in the Earth's atmosphere and geomagnetic storms. The
method of cumulative summation curve was applied to predict the highly
energetic solar flare by two or three days prior to the flare occurrence.
The result indicate that the method is reliable for high solar flare forecasting.
Organization: National Research Institute of Astronomy and Geophysics
Telephone: +2 10-515-6443
Helwan - Cairo
Above is background material for archival reference only.