Physics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..553f&link_type=abstract
Journal of Geophysical Research, vol. 80, Feb. 1, 1975, p. 553-574.
Physics
12
Auroras, Electron Precipitation, Magnetospheric Instability, Polar Substorms, Proton Precipitation, Ring Currents, Antarctic Regions, Dynamic Characteristics, Emission Spectra, Geomagnetism, H Beta Line, Lines Of Force, Magnetic Variations, Oxygen Spectra, Space-Time Functions
Scientific paper
Meridian-scanning photometry investigating the developing features of the proton and electron auroral substorms found that during the period preceding the onset of a substorm expansion phase, the emission zone of the proton aurora moves equatorward with a speed of 100-250 m/s, accompanying the development of the ring current. At the onset of the expansion phase the quiet arcs suddenly brighten generally in the premidnight region and the electron auroral bulge rapidly expands poleward with a large inbulge, whereas breakup-type electron auroras (arcs or bands) are not observed in the expanding proton auroral bulge. Therefore it is suggested that there is a mechanism that accelerates electrons in the premidnight region and protons in the postmidnight region along the geomagnetic field lines down to the ionosphere. After the onset of the expansion phase the luminosity of the proton aurora greatly increases in the evening region, and simultaneously, the emission zone expands equatorward, accompanying the development of the asymmetrical partial ring current and the positive bay in this local time region. This relation indicates that the source of the proton aurora in the evening region is the injected ring current protons.
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