Enhancement of optical aurora triggered by the solar wind negative pressure impulse (SI-)

Details Enhancement of optical aurora triggered by the solar wind negative pressure impulse (SI-) Enhancement of optical aurora triggered by the solar wind negative pressure impulse (SI-)

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..127s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 1, p. 127-130

Physics

8

Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

A geomagnetic negative sudden impulse (SI-) occurred on 3 August 1997 in association with a sudden decrease of solar wind dynamic pressure. The discrete auroras observed by an all-sky TV imager at Zhongshan in Antarctica (magnetic latitude is ~74.5°S) suddenly enhanced their luminosity and moved poleward at the time of the SI-. Following the primary enhancement, three cycles of quasi-periodic luminosity pulsations were observed with periods of about 10-14 min and their average position drifted equatorward. The luminosity pulsations showed one-to-one correspondence with the magnetic pulsations, with the characteristic features of a field-line resonance. The low-altitude DMSP-F13 satellite was almost directly over Zhongshan and observed accelerated electron precipitation with an inverted `V' structure and an upward field-aligned current. These signatures suggest that the solar wind negative pressure impulse triggered a field-line resonance of the geomagnetic field. The resonance caused the upward and downward field-aligned current sheets, and the field-aligned electron acceleration.

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