A "black light flare" observed by HMI?

Details A "black light flare" observed by HMI? A "black light flare" observed by HMI?

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23a1827m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH23A-1827

Astronomy and Astrophysics

Astrophysics

[7519] Solar Physics, Astrophysics, And Astronomy / Flares

Scientific paper

We report the observation of a negative precursor to the white-light flare SOL2010-06-12T00:57 (M2.0), as observed via SDO/HMI in narrow bands near 6173.3 A. RHESSI and Fermi hard X-ray and gamma-ray observations for this flare are also available and reveal an unusually hard spectrum in the hard X-ray range. The "black light flare" locations are in both of the two white-light flare emission regionsand precede them by about one HMI time step of 45 s. The timing thus resembles that predicted by Henoux et al. (1990) based on the interplay between ionization (leading to opacity) and heating (leading to emission). We discuss this remarkable event in its full observational scope.

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