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Paper: Magnetic Structure of Ultracool Stars Inferred from Quiescent and Flaring Radio Emission
Volume: 518, Physics of Magnetic Stars
Page: 162
Authors: Stepanov, A. V.; Zaitsev, V. V.
Abstract: We determine the magnetic structure of ultracool stars from peculiarities in quiescent and flaring radio emission. It is shown that gyrosynchrotron emission from a number of magnetic loops distributed over the star surface can be responsible for the slowly varying radio emission. The flaring component with high brightness temperature can be interpreted in terms of electron cyclotron maser emission or as coherent plasma radiation. The electric field driven by electric current oscillations in a coronal loop can result in acceleration of electrons generating long-lived radio emission. From the TVLM 513-46546 radio data we concluded that the magnetic structure of the star consists of a compact active region with several magnetic loops generating intense polarized radio emission and of numerous loops, the sources of the quiescent component, quasi-uniformly distributed over the star surface.
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