The Neupert effect and the electron-beam-driven evaporation model

Details The Neupert effect and the electron-beam-driven evaporation model The Neupert effect and the electron-beam-driven evaporation model

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..367v&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

1

Solar Flares: X-Rays, Evaporation

Scientific paper

Based on a sample of ~1100 solar flares observed simultaneously in hard and soft X-rays, we performed a statistical analysis of the Neupert effect. For a subset of ~500 events, supplementary Hα flare data were considered. The timing behavior of >50% of the events is consistent with the Neupert effect. A high correlation between the soft X-ray peak flux and the hard X-ray fluence is obtained, being indicative of electron-beam-driven evaporation. However, about one fourth of the events (predominantly weak flares) reveal strong deviations from the predicted timing, with a prolonged increase of the thermal emission beyond the end of the hard X-rays. These findings suggest that electron-beam-driven evaporation plays an important role in solar flares. Yet, in a significant fraction of events there is also evidence for an additional energy transport mechanism from the energy release site other than electron beams, presumably thermal conduction.

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