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Summary: 1
THE NEUPERT EFFECT IN GEMINORUM
K.W. Smith 1;2 , M.Gudel 1 , M. Audard 1 , E. Behar 3 , R. Mewe 4 , and A.J. Beasley 5
1 Paul Scherrer Institut, Wurenlingen and Villigen, CH-5232 Villigen PSI, Switzerland
2 Institute of Astronomy, ETH Zurich, CH-8092, Switzerland
3 Columbia University, New York, NY 10027, USA
4 SRON Laboratory for Space Research, 3584 CA Utrecht, The Netherlands.
5 Owens Valley Radio Observatory, California Institute of Technology, Big Pine, California, USA
Abstract
The RS CVn-type binary Geminorum was observed
during a large, long-duration
are simultaneously with
XMM-Newton and the VLA. The light curves show a char-
acteristic time dependence that is compatible with the Ne-
upert e ect observed in solar
ares - the time derivative of
the X-ray light curve resembles the radio light curve. This
observation can be interpreted in terms of a standard
are
scenario in which accelerated coronal electrons reach the
chromosphere where they heat the cool plasma and induce
chromospheric evaporation. Such a scenario can only hold
if the amount of energy in the fast electrons is suÆcient to
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