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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the Origin of Pulsations of Sub-THz Emission from Solar Flares

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Author(s):
Zaitsev, V. V. [1] ; Stepanov, A. V. [2] ; Kaufmann, P. [3]
Total Authors: 3
Affiliation:
[1] Inst Appl Phys, Nizhnii Novgorod 603950 - Russia
[2] Pulkovo Observ, St Petersburg 196140 - Russia
[3] Uniersidade Presbiteriana Mackenzie, Escola Engn, Ctr Radioastron & Astrofis Mackenzie, BR-01302907 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SOLAR PHYSICS; v. 289, n. 8, p. 3017-3032, AUG 2014.
Web of Science Citations: 10
Abstract

We propose a model to explain fast pulsations in sub-THz emission from solar flares. The model is based on the approach of a flaring loop as an equivalent electric circuit and explains the pulse-repetition rate, the high-quality factor, Qa parts per thousand yen10(3), low modulation depth, pulse synchronism at different frequencies, and the dependence of the pulse-repetition rate on the emission flux, observed by Kaufmann et al. (Astrophys. J. 697, 420, 2009). We solved the nonlinear equation for electric current oscillations using a Van der Pol method and found the steady-state value for the amplitude of the current oscillations. Using the pulse rate variation during the flare on 4 November 2003, we found a decrease of the electric current from 1.7x10(12) A in the flare maximum to 4x10(10) A just after the burst. Our model is consistent with the plasma mechanism of sub-THz emission suggested recently by Zaitsev, Stepanov, and Melnikov (Astron. Lett. 39, 650, 2013). (AU)

FAPESP's process: 06/06847-1 - Solar activity emissions from submillimeter waves to infrared (SIRA)
Grantee:Pierre Kaufmann
Support type: Research Projects - Thematic Grants