Dawn and dusk auroras caused by gradual, intense solar wind ram pressure events

Details Dawn and dusk auroras caused by gradual, intense solar wind ram pressure events Dawn and dusk auroras caused by gradual, intense solar wind ram pressure events

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..153z&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 2, p. 153-160.

Physics

4

Scientific paper

Using Polar UVI data, dawn and dusk auroras are studied. The auroras are shown to be controlled by gradual (T>30min), intense (Pram>=10nPa) solar wind ram pressure events when the interplanetary magnetic field is northward. The UV auroral intensities vary linearly with the solar wind ram pressure (ρV2). As the pressure rises, the auroral intensity increases, and as the pressure returns to normal values, the auroral intensity decreases. Linear regression analyses have been performed, and resultant correlation coefficients for different events have been found to be significant. R values lie in a range of 0.79-0.97. The peak auroral intensities occur at peak solar wind pressures. The dawn and dusk auroras are speculated to be generated by some form of viscous interaction occurring on the magnetopause flanks, such as the Kelvin-Helmholtz instability, magnetic or by shearing, and Alfvén wave heating.

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