Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icrc....2..463d&link_type=abstract
IN: International Cosmic Ray Conference, 22nd, Dublin, Republic of Ireland, Aug. 11-23, 1991, Laboratory for High Energy Astroph
Astronomy and Astrophysics
Astronomy
Cataclysmic Variables, Magnetic Clouds, Particle Acceleration, Radio Astronomy, Synchrotron Radiation, X Ray Astronomy, Polar Caps, Radio Emission, Shock Waves
Scientific paper
The novalike cataclysmic variable AE Aquarii shows evidence for radio synchrotron emission from expanding magnetized clouds. The radio and UV flare timescales are similar indicating that the central engine is located close to the white dwarf. A collisionless shock may develop above the polar cap, which may explain the observed temperature. Protons and ions accelerated up to energies of more than 1 TeV can diffuse away from the central engine, enter magnetized clouds, and generate waves which in turn heat and accelerate electrons. An embarrassing situation exists where reprocessed optical and X-ray pulsations (33 s) are observed, but the expected direct X-ray pulse from the white dwarf is absent. The standard theory for CVs cannot explain this, and one possible explanation is that a beam of relativistic protons and ions from the polar cap may give the observed reprocessed optical to X-rays in a thick target fixed in the system.
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