Heating the Quiet Corona by Nanoflares: Evidence and Problems

Details Heating the Quiet Corona by Nanoflares: Evidence and Problems Heating the Quiet Corona by Nanoflares: Evidence and Problems

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51c06b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP51C-06 INVITED

Physics

7509 Corona, 7519 Flares, 7549 Ultraviolet Emissions

Scientific paper

Recent imaging observations of coronal EUV line emission have shown evidence for frequent flare-like events in a majority of the pixels in quiet regions. The changes in the coronal emission measure indicate the impulsive heating of new material to coronal temperatures. Estimates of the energy input into the corona by these "nanoflares" differ widely in the literature. Here we discuss the proposed methods and interpret the different results by the various recent analyses. The results using similar EUV data from EIT/SOHO and TRACE basically agree on the power-law exponent when the same method is used. The extrapolation of the power law to energies that are many orders of magnitude smaller remains doubtful, however. Nevertheless, the inferred energy input into the corona by the micro-events in the observable range has been reported to be of the order of 10 percent of the observed radiation output by EIT observations. It is considerably smaller for TRACE. The discrepancy can be explained only partially by different thresholds for flare detection. It is pointed out that the deviation between the different analyses in the number of nanoflares per energy and time unit is more serious than the widely discussed differences in the power law index.

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