Microflares and the statistics of x-ray flares

Hannah, I.G. , Hudson, H.S., Battaglia, M., Christe, S., Ka\v sparová, J., Krucker, S., Kundu, M.R. and Veronig, A. (2011) Microflares and the statistics of x-ray flares. Space Science Reviews, 159(1-4), pp. 263-300. (doi: 10.1007/s11214-010-9705-4)

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This review surveys the statistics of solar X-ray flares, emphasising the new views that RHESSI has given us of the weaker events (the microflares). The new data reveal that these microflares strongly resemble more energetic events in most respects; they occur solely within active regions and exhibit high-temperature/nonthermal emissions in approximately the same proportion as major events. We discuss the distributions of flare parameters (e.g., peak flux) and how these parameters correlate, for instance via the Neupert effect. We also highlight the systematic biases involved in intercomparing data representing many decades of event magnitude. The intermittency of the flare/microflare occurrence, both in space and in time, argues that these discrete events do not explain general coronal heating, either in active regions or in the quiet Sun.

Item Type:Articles
Keywords:Sun, Flares, X-rays
Glasgow Author(s) Enlighten ID:Hannah, Dr Iain
Authors: Hannah, I.G., Hudson, H.S., Battaglia, M., Christe, S., Ka\v sparová, J., Krucker, S., Kundu, M.R., and Veronig, A.
Subjects:Q Science > QB Astronomy
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Space Science Reviews
Published Online:23 July 2011

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