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Spectroscopic Features in the EUV Emission of a M8 Flare Observed by SUMER

Published online by Cambridge University Press:  13 May 2016

W. Curdt ,
E. Landi ,
U. Feldman ,
D. Innes ,
B. Dwivedi  and
K. Wilhelm
W. Curdt
Affiliation:
Max-Planck-Insitut für Aeronomie, 37191 Katlenburg-Lindau, Germany
E. Landi
Affiliation:
Max-Planck-Insitut für Aeronomie, 37191 Katlenburg-Lindau, Germany E.O. Hulburt Center for Space Res., NRL, Washington DC 20375, USA
U. Feldman
Affiliation:
E.O. Hulburt Center for Space Res., NRL, Washington DC 20375, USA
D. Innes
Affiliation:
Max-Planck-Insitut für Aeronomie, 37191 Katlenburg-Lindau, Germany
B. Dwivedi
Affiliation:
Max-Planck-Insitut für Aeronomie, 37191 Katlenburg-Lindau, Germany Department of Applied Physics, Banaras Hindu University, Varanasi-221005, India
K. Wilhelm
Affiliation:
Max-Planck-Insitut für Aeronomie, 37191 Katlenburg-Lindau, Germany

Abstract

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A flare of size M8 occurred while SUMER was recording a spectral scan above the active region NOAA 8537 at the west limb. We recorded spectra during the pre-flare phase, at flare onset, and during the decay phase of this main flare in a series of events. More than 60 flare lines were identified during this observation, which include Fe XVIII - Fe XXIII lines that provide evidence of 107 K plasmas. We also recorded lines from He-like ions, such as Ne IX, Na x, Mg XI, and Si XIII. Accurate wavelength measurements of such lines are of interest in basic atomic physics studies. Using plasma diagnostic techniques, we investigated the temporal evolution of the electron densities and temperatures during the event.

Type
Session III: Active Region Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 260 - 263
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Curdt, W., Landi, E., Wilhelm, K., & Feldman, U. 2000, Phys. Rev. A 62, 022502.Google Scholar
Drake, G.W.F. 1988, Can. J. Phys. 66, 586.Google Scholar
Feldman, U., Curdt, W., Landi, E., & Wilhelm, K. 2000, ApJ 544, in press.Google Scholar
Innes, D. 2000, this volume.Google Scholar