Observations of the Neupert Effect with the Solar Dynamics Observatory, Reuven Ramaty High Energy Solar Spectroscopic Imager, and Geostationary Operational Environmental Satellite

Details Observations of the Neupert Effect with the Solar Dynamics Observatory, Reuven Ramaty High Energy Solar Spectroscopic Imager, and Geostationary Operational Environmental Satellite Observations of the Neupert Effect with the Solar Dynamics Observatory, Reuven Ramaty High Energy Solar Spectroscopic Imager, and Geostationary Operational Environmental Satellite

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914410s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #144.10

Astronomy and Astrophysics

Astronomy

Scientific paper

The Neupert Effect is an empirically observed correlation between the hard X-rays (HXR) and the time derivative of soft X-rays (SXR) emitted during the impulsive phase of a solar flare. According to standard models of magnetic reconnection driven flares, accelerated electron beams are responsible for creating the HXR Bremsstrahlung radiation in the Transition Region and upper Chromosphere. This energy input should also heat the relatively low-temperature Chromospheric plasma, increasing the intensity of extreme ultraviolet (EUV) emission lines. The launch of the Extreme Ultraviolet Variability Experiment (EVE) on board the Solar Dynamics observatory (SDO) has for the first time provided measurements of the solar irradiance spectra with 0.1 nm spectral resolution over the range 6.5-37 nm at 10-second cadence and nearly 100% duty cycle. Comparisons were made using the EUV spectral data from EVE, SXR measured by the X-Ray Spectrometer (XRS) on the Geostationary Operational Environmental Satellites (GOES), and HXR recorded with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The first focus of the investigation looked at the timing of the HXR, time derivative of soft X-ray, and the Helium-II 304Å doublet. The second focus compared He II images taken by the Atmospheric Imaging Assembly (AIA) (also on SDO) to x-ray images taken by RHESSI to compare the spatial location and area of the lower atmospheric energy emissions. We investigated all M class and above flares between May 1st 2010 and June 1st 2011 with complete coverage by all three instruments totaling 31 events. Of these, 77% (24) showed the expected Neupert Effect with 70% (17) of these events also displaying He-II profiles consistent with the electron beam heating model. This collaboration was organized through the SESI internship program at GSFC and funded by the Catholic University of America.

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