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28 March 2024
 
  » arxiv » astro-ph/0106369

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Microwave plasma emission of a flare on AD Leo
A. V. Stepanov ; B. Kliem ; V. V. Zaitsev ; E. Fuerst ; A. Jessner ; A. Krueger ; J. Hildebrandt ; J. H. M. M. Schmitt ;
Date 20 Jun 2001
Journal Astron.Astrophys. 374 (2001) 1072
Subject astro-ph
AbstractAn intense radio flare on the dMe star AD Leo, observed with the Effelsberg radio telescope and spectrally resolved in a band of 480 MHz centred at 4.85 GHz is analysed. A lower limit of the brightness temperature of the totally right handed polarized emission is estimated as T_b ~ 5x10^10 K (with values T_b > ~3x10^13 K considered to be more probable), which requires a coherent radio emission process. In the interpretation we favour fundamental plasma radiation by mildly relativistic electrons trapped in a hot and dense coronal loop above electron cyclotron maser emission. This leads to densities and magnetic field strengths in the radio source of n ~ 2x10^11 cm^-3 and B ~ 800 G. Quasi-periodic pulsations during the decay phase of the event suggest a loop radius of r ~ 7x10^8 cm. A filamentary corona is implied in which the dense radio source is embedded in hot thin plasma with temperature T >= 2x10^7 K and density n_ext <= 10^-2 n. Runaway acceleration by sub-Dreicer electric fields in a magnetic loop is found to supply a sufficient number of energetic electrons.
Source arXiv, astro-ph/0106369
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