Abstract
An analysis of the August 20, 2002 flare using RHESSI, Hα, and radio observations is presented. Radio data in the decimetric frequency range showed a type IIId (relativistic) burst at the time of the X-ray maximum. At this time a very flat (γphot = 1.8) X-ray spectrum was measured. Fitted double power-law spectra in the thick-target model revealed an increase of the low energy cuto in the electron spectrum that rose to as high as 81 keV. This cutoff evolution is interpreted as a possible gap in energies of electrons injected into the X-ray thick-target source and those of the background plasma. Fast changes of Ha intensities were found to be located away from the X-ray sources in the beginning of the Ha flare.
This paper is a short version of Kašparová et al. (2004)
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Canfield, R.C. and Gayley, K.G.: 1987, Astrophys. J. 363, 1999.
Dennis, B.R.: 1985, Solar Phys. 100, 465.
Gan, W.Q., Li, Y.P., Chang, J., and McTiernan, J.M.: 2002, Solar Phys. 207, 137.
Kašparová, J., Karlický, M., Schwartz, R.A., and Dennis, B.R.: 2004, Solar Phys., subm.
Machado, M.E., Avrett, E.H., Vernazza, J.E., and Moyes, R.W.: 1980, Astron. Astrophys. 242, 336.
Trottet, G., Rolli, E., Magun, A., Barat, C., Kuznetsov, A., Sunyaev, R., and Terekhov, O.: 2000, Astron. Astrophys. 356, 1067.
SEC: 2002, http://www.sec.noaa.gov/weekly/pdf/prf1408.pdf
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2005 Springer
About this paper
Cite this paper
Kašparová, J., Karlický, M., Schwartz, R., Dennis, B. (2005). X-Ray and HαEmission of the 20 Aug 2002 Flare*. In: Hanslmeier, A., Veronig, A., Messerotti, M. (eds) Solar Magnetic Phenomena. Astrophysics and Space Science Library, vol 320. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2962-4_12
Download citation
DOI: https://doi.org/10.1007/1-4020-2962-4_12
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-2961-5
Online ISBN: 978-1-4020-2962-2
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)