Radio pulsations from AD Leo: diagnostics of electric currents and plasma parameters in stellar flares

Details Radio pulsations from AD Leo: diagnostics of electric currents and plasma parameters in stellar flares Radio pulsations from AD Leo: diagnostics of electric currents and plasma parameters in stellar flares

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..17e..24k&link_type=abstract

Highlights of Recent Progress in the Seismology of the Sun and Sun-Like Stars, 26th meeting of the IAU, Joint Discussion 17, 23

Astronomy and Astrophysics

Astronomy

Scientific paper

Using pulsations characteristics from AD Leo radio flares observed with Arecibo (Bastian et al., 1990) and Effelsberg (Stepanov et al. , 2001) radio telescopes, the values of electric currents (7-40)×10 ^11 A and plasma parameters in stellar flares are determined. It was shown that radio pulsations can be due to both sausage oscillations of as well as current RLC-oscillations in a flare loop (Zaitsev et al ., 1988, 2004). Explanation of very intense radio bursts (T[b ]≥ 10^15 K) in terms of coherent plasma emission gives the magnetic field value (100-300 G) and the electron number density (10^10^ - 10^11 cm^-3) in the flares. The energy of electric current stored in flares was estimated as (1-50) ×10^25 J. It is shown that <10% of stored energy was released in the flares. References Bastian, T., Bookbinder, J., Dulk, G.A., Davis, M. 1990, ApJ, 353, 265 Stepanov, A.V., Kliem, B., Zaitsev, V.V. et al. 2001, A&A, 374, 1072 Zaitsev, V.V., Stepanov, A.V., Urpo, S., Pohjolainen, S., 1998, A& A, 337, 887. Zaitsev, V.V., Kislyakov, A.G., Stepanov, A.V., Kliem, B., Fuerst, E. 2004, Astron. Lett. 30, 319

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