The Neupert Effect in Filamented versus Monolithic Solar Flare Loop Structures

Details The Neupert Effect in Filamented versus Monolithic Solar Flare Loop Structures The Neupert Effect in Filamented versus Monolithic Solar Flare Loop Structures

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1304s&link_type=abstract

American Astronomical Society, SPD meeting #37, #13.04; Bulletin of the American Astronomical Society, Vol. 38, p.241

Astronomy and Astrophysics

Astronomy

2

Scientific paper

In many flares, the soft X-ray light curves resemble the time integral of the corresponding hard X-ray lightcurves, a phenomenon called the Neupert effect. The favoured explanation is that non-thermal electrons which emit bremsstrahlung in hard X-rays deposit the bulk of their energy in collisions in the dense chromosphere. In turn, the cool plasma in the chromosphere is heated to high temperatures and evaporated into the corona, which is discernible as a rise of the soft X-ray light curve and the emission measure.We have investigated if we can attribute the observed emission measure enhancement at the flare peaks to the described process of beam driven chromospheric evaporation using a set of RHESSI microflares (GOES class < C1.4). In contrast, we consider the case of a thermal flare origin, i.e. if the peak emission measures of the analysed events agree with the theoretically expected values from chromospheric evaporation driven by heat conduction. For both cases, we consider a single loop and a filamentary loop model. We do not use detailed hydromodelling but use simple analytic expressions. The work is intended to find explanations for problems encountered when comparing the empirical to the theoretical Neupert effect as well as to distinguish between possible formation processes of the analysed flares. The parameters involved (peak emission measure, temperature, electron spectral indices, flare geometry variables) are determined from RHESSI spectroscopy and TRACE 1600 A data in combination with RHESSI imaging.

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