Observations of Nanoflare Produced Hot ( 10 Mk) Plasma

Details Observations of Nanoflare Produced Hot ( 10 Mk) Plasma Observations of Nanoflare Produced Hot ( 10 Mk) Plasma

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1214k&link_type=abstract

American Astronomical Society, SPD meeting #40, #12.14; Bulletin of the American Astronomical Society, Vol. 41, p.830

Astronomy and Astrophysics

Astronomy

Scientific paper

Indirect observational evidence suggests that some or most of the corona is heated impulsively on sub-resolution scales by nanoflares. Theoretical studies of possible heating mechanisms also support this picture. However, the most direct evidence of nanoflares---plasma hotter than 5 MK---has been difficult to obtain because the emission is expected to be very faint. The reason is two-fold: first, hot plasma cools very rapidly by thermal conduction; and second, densities are small because chromospheric evaporation has not had time to fill the corona. Recent observations from several instruments have now provided strong evidence of hot plasma. We report here on the detection of 10 MK plasma by the X-Ray Telescope (XRT) on Hinode. We show that the intensity of the emission is consistent with nanoflare models, but is extremely difficult to explain with steady heating.

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