Solar Microwave Drifting Spikes and Solitary Kinetic Alfvén Waves

Astronomy and Astrophysics – Astronomy

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Plasmas, Sun: Corona, Sun: Radio Radiation, Waves

Scientific paper

Mechanisms driving eruptive phenomena and elementary processes occurring at the smallest coherent scales have been outstanding problems in solar physics. In this Letter, a novel kind of fine structures of solar radio bursts, ``solar microwave drifting spikes'' (SMDSs), is reported. Our analysis shows that the SMDSs can be produced by a group of ``solitary kinetic Alfvén waves'' (SKAWs) with small cross-field scales, in which the electrons in the SKAWs are accelerated self-consistently by the SKAW electric fields to tens of keV and trapped within the SKAW potential wells. It is these trapped electrons that trigger the SMDSs. And the frequency drifts of the SMDSs are attributed to the SKAW propagation along the magnetic field. The SKAWs are exact solutions of two-fluid equations for a low-β plasma and have been experimentally verified in the magnetosphere, where they accelerate auroral electrons to several keV. We believe the SMDSs represent a new observational signature of SKAWs in the solar atmosphere.

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