Physics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35..145z&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, Feb. 1987, p. 145-151.
Physics
13
Ionospheric Conductivity, Ionospheric Currents, Magnetic Disturbances, Traveling Ionospheric Disturbances, Auroral Zones, Electron Energy, Field Aligned Currents, Hall Effect
Scientific paper
A global westward traveling surge model is formulated to study the evolution of the convection pattern, the surge velocity, the field-aligned current and the conductivity distributions. The time scale of the model is governed by the recombination in the auroral ionosphere. The main results are as follows. (1) The Harang discontinuity is formed due to the blockage of the Hall current from diverging along field lines. (2) The westward-traveling surge moves rapidly at the onset of a substorm and then slows down to become stationary as the substorm subsides. The average westward speed is a few kilometers per second for auroral electrons of a few kiloelectronvolts energy. The speed increases with the energy of the auroral electrons. (3) The sense of the field-aligned current in the post-midnight sector agrees with region I and region II current only when the Hall current is 'blocked' from diverging along field lines.
Kan Joseph R.
Zhu Lijun
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