The effect of the solar wind velocity on substorm activity

Details The effect of the solar wind velocity on substorm activity The effect of the solar wind velocity on substorm activity

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9413571r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 1, 1989, p. 13571-13574. Research sponsored by BMFT.

Physics

6

Polar Substorms, Solar Terrestrial Interactions, Solar Wind Velocity, Space Plasmas, Annual Variations, Auroral Zones, Interplanetary Magnetic Fields, Polarity

Scientific paper

Data from seven solar rotation periods, partitioned into several smaller periods, are used to study the response of auroral zone magnetic activity to the IMF polarity at low and high solar wind velocities. At low velocities magnetic activity is almost exclusively controlled by negative B(z) values; the magnetosphere acts like a half wave rectifier. At high velocities, however, magnetic activity starts to increase already in the positive B(z) range, at about +5 nT. This result poses strong constraints on the generally accepted reconnection/merging models. The solar wind power necessary to drive the magnetic activity observed in the positive B(z) range is estimated to amount to 4 x 10 to the 17th ergs/s.

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