Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0804.4037)
· References in the article
· Citations to the Article (3) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Broadband Quasi-periodic Radio and X-Ray Pulsations in a Solar Flare
Authors:
Fleishman, Gregory D.; Bastian, T. S.; Gary, Dale E.
Affiliation:
AA(New Jersey Institute of Technology, Newark, NJ 07102.; Ioffe Physico-Technical Institute, St. Petersburg 194021, Russia.), AB(National Radio Astronomy Observatory, Charlottesville, VA 22903.), AC(New Jersey Institute of Technology, Newark, NJ 07102.)
Publication:
The Astrophysical Journal, Volume 684, Issue 2, pp. 1433-1447. (ApJ Homepage)
Publication Date:
09/2008
Origin:
UCP
ApJ Keywords:
Acceleration of Particles, Magnetohydrodynamics: MHD, Sun: Flares, Sun: Oscillations, Sun: Radio Radiation, Sun: X-Rays, Gamma Rays
DOI:
10.1086/589821
Bibliographic Code:
2008ApJ...684.1433F

Abstract

We describe microwave and hard X-ray observations of strong quasi-periodic pulsations from the GOES X1.3 solar flare on 2003 June 15. The radio observations were made jointly by the Owens Valley Solar Array (OVSA), the Nobeyama Polarimeter (NoRP), and the Nobeyama Radioheliograph (NoRH). Hard X-ray observations were made by RHESSI. Using Fourier analysis, we study the frequency- and energy-dependent oscillation periods, differential phase, and modulation amplitudes of the radio and X-ray pulsations. Focusing on the more complete radio observations, we also examine the modulation of the degree of circular polarization and of the radio spectral index. The observed properties of the oscillations are compared with those derived from two simple models for the radio emission. In particular, we explicitly fit the observed modulation amplitude data to the two competing models. The first model considers the effects of MHD oscillations on the radio emission. The second model considers the quasi-periodic injection of fast electrons. We demonstrate that quasi-periodic acceleration and injection of fast electrons is the more likely cause of the quasi-periodic oscillations observed in the radio and hard X-ray emission, which has important implications for particle acceleration and transport in the flaring sources.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints