EDP Sciences
Free Access
Volume 440, Number 2, September III 2005
Page(s) L59 - L62
Section Letters
DOI https://doi.org/10.1051/0004-6361:200500169

A&A 440, L59-L62 (2005)
DOI: 10.1051/0004-6361:200500169


X-ray quasi-periodic pulsations in solar flares as magnetohydrodynamic oscillations

C. Foullon1, E. Verwichte1, V. M. Nakariakov1 and L. Fletcher2

1  Department of Physics, University of Warwick, Coventry CV4 7AL, UK
    e-mail: foullonc@astro.warwick.ac.uk
2  Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK

(Received 21 June 2005 / Accepted 2 August 2005)

We report the first observation at high spatial resolution of long-period quasi-periodic pulsations (QPP) of X-ray radiation during solar flares, made possible with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), supported by complementary data at other wavelengths from space-based and ground-based telescopes. Evidence for the presence of a transequatorial loop possibly responsible for the detected periodicity connected with its kink mode is found. Our findings suggest that QPP can be interpreted as a periodic pumping of electrons in a compact flaring loop, modulated by oscillations in a magnetically linked and larger loop acting as a long-period magnetohydrodynamic resonator.

Key words: Sun: corona -- flares -- oscillations -- X-rays, gamma rays

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.