Mathematics – Logic
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..494n&link_type=abstract
Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 494-500.
Mathematics
Logic
11
Magnetic Storms, Magnetohydrodynamic Stability, Neutron Stars, Stellar Magnetic Fields, Stellar Mass Accretion, X Ray Sources, Bursts, Earth Magnetosphere, Magnetic Control, Magnetohydrodynamic Flow, Plasma Dynamics, Polar Substorms, Stellar Winds
Scientific paper
A model for X-ray bursts from accreting neutron stars is developed by analogy with geomagnetic substorms. The essential steps in the substorm process are the nearly steady merging or reconnection of the magnetic field in the magnetosphere with the field in the stellar wind, the transport of some of the merged plasma into a magnetically controlled tail, and the explosive release of plasma from the tail into the magnetosphere. The strength of the magnetic field in the stellar wind required to drive a substorm is approximately 0.1 gauss. If the stellar wind is organized into large-scale magnetic sectors, as is the solar wind, topological dissipation will not occur, and the large-scale field will be available for merging at the magnetopause. Once the material is in the tail, the time scales for the Kruskal-Schwarzschild instability and the unidentified instability which drives terrestrial substorms may be comparable. Alternating periods of burst activity and quiescence could be caused by passage from one sector to another with opposite polarity, or be seasonal variations.
Neugebauer Matthias
Tsurutani Bruce T.
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