NDLI: Analysis of the impulsive phase of a solar flare at submillimeter wavelengths

Content Provider	Springer Nature Link
Author	Raulin, Jean Pierre Makhmutov, Vladimir S. Kaufmann, Pierre Pacini, Alessandra Abe Lüthi, Thomas Hudson, Hugh S. Gary, Dale E.
Copyright Year	2004
Abstract	We present a report on the strong X5.3 solar flare which occurred on 25 August 2001, producing high-level γ-ray activity, nuclear lines and a dramatic long-duration white-light continuum. The bulk of millimeter radio fluxes reached a peak of ∼100 000 solar flux units at 89.4 GHz, and a few thousands of solar flux units were detected in the submillimeter range during the impulsive phase. In this paper we focus on and discuss (i) the implications inferred from high frequency radio observations during the impulsive phase; (ii) the dynamics of the low corona active region during the impulsive phase. In particular we found that 4–5 × 10$^{36}$ accelerated (>20 keV) electrons s$^{−1}$ radiating in a 1000–1100 G region, are needed to explain the millimeter to submillimeter-wave emissions. We present evidence that the magnetic field in the active region was very dynamic, and that strong non-thermal processes were triggered by the appearance of new, compact, low-lying (few thousand kilometers) loop systems, suggesting the acceleration site(s) were also located in the low solar atmosphere.
Starting Page	181
Ending Page	199
Page Count	19
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	223
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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