X-RAY QUASI-PERIODIC PULSATIONS IN SOLAR FLARES ASMAGNETOHYDRODYNAMIC OSCILLATIONS

摘要

In Foullon et al. (2005), we reported the first observationrnat high spatial resolution of long-period (8-12 min)rnquasi-periodic pulsations (QPP) of X-ray radiation duringrnsolar flares, made possible with the Reuven RamatyrnHigh Energy Solar Spectroscopic Imager (RHESSI), supportedrnby complementary data at other wavelengths fromrnspace-based and ground-based telescopes. Evidence forrnthe presence of a transequatorial loop possibly responsiblernfor the detected periodicity connected with its kinkrnmode is found. Our findings suggest that QPP can be interpretedrnas a periodic pumping of electrons in a compactrnflaring loop, modulated by oscillations in a magneticallyrnlinked and larger loop acting as a long-period magnetohydrodynamicrnresonator.