Letter to the Editor
X-ray quasi-periodic pulsations in solar flares as magnetohydrodynamic oscillations
Department of Physics, University of Warwick, Coventry CV4 7AL, UK e-mail: firstname.lastname@example.org
2 Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
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