Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phys...39..782b&link_type=abstract
Physica Scripta (ISSN 0031-8949), vol. 39, no. 6, June 1989, p. 782-786. Research supported by the Swedish Board for Space Activ
Physics
18
Auroral Zones, Earth Magnetosphere, Geomagnetism, Plasma Diagnostics, Solitary Waves, Space Plasmas, Field Aligned Currents, Ion Cyclotron Radiation, Lines Of Force, Plasma Layers, Swedish Space Program
Scientific paper
Two point measurements of plasma density fluctuations and measurements of potential fluctuations obtained during the Viking low frequency wave experiment are used to study the small-scale large-amplitude solitary structures in the auroral acceleration region. It is shown that the structures have a spatial scale of the order of 100 m, density depletions of up to 50 percent, and negative potentials of up to about 5V. The structures propagate upward along the magnetic field lines with velocities from about 5 to more than 50 km/s, and they are characterized as solitary waves and weak double layers or holes in the thermal ion and phase space distributions. Their occurrence is found to be correlated with that of beams (dominated by protons and electrostatic ion cyclotron waves) of upward flowing energetic ions.
Bostrom Rolf
Holback Bengt
Holmgren Gunnar
Koskinen Hannu
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