Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work..247m&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 247-250 (SEE N89-24910 18-75)
Astronomy and Astrophysics
Astrophysics
Gamma Ray Bursts, Neutron Stars, Seismic Waves, Starquakes, Stellar Oscillations, Field Strength, Magnetohydrodynamic Waves, Plasma Acceleration, Shear Stress, Shock Wave Luminescence, Shock Wave Propagation
Scientific paper
The possibility that gamma-ray bursts originate from quakes deep in the solid crust of a neutron star is investigated. Seismic waves are radiated if shear stress is relieved by brittle fracture. However they cannot propagate directly to the surface but are temporarily trapped below a reflecting layer. The shaking of the stellar surface couples the seismic waves to Alfven waves which propagate out into the magnetosphere. The crust-magnetosphere transmission coefficient strongly increases with wave frequency and magnetic field strength. Alfven wave luminosities sufficient to power galactic gamma-ray bursts are possible if magnetic fields greater than 100 billion G cover at least part of the stellar surface. As the Alfven waves propagate out into the low density magnetosphere, they become increasingly charge starved, thereby accelerating particles to relativistic energies.
Blaes Omer
Blandford Roger. D.
Goldreich Peter
Madau Piero
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