Do interplanetary Alfven waves cause auroral activity?

Details Do interplanetary Alfven waves cause auroral activity? Do interplanetary Alfven waves cause auroral activity?

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4327r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4327-4331.

Physics

4

Auroral Electrojets, Magnetohydrodynamic Waves, Solar Planetary Interactions, International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Magnetic Storms, Solar Wind

Scientific paper

A recent theory holds that high-intensity, long-duration, continuous auroral activity (HILDCAA) is caused by interplanetary Alfven waves propagating outward from the sun. A survey of Alfvenic intervals in over a year of ISEE 3 data shows that while Alfvenic intervals often accompany HILDCAAs, the reverse is often not true. There are many Alfvenic intervals during which auroral activity (measured by high values of the AE index) is very low, as well as times of high auroral activity that are not highly Alfvenic. This analysis supports the common conclusion that large AE values are associated with a southward interplanetary field of sufficient strength and duration. This field configuration is independent of the presence of Alfven waves (whether solar generated or not) and is expected to occur at random intervals in the large-amplitude stochastic fluctuations in the solar wind.

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