Other
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33...81a&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 33, Jan. 1985, p. 81-85, 87.
Other
3
Geomagnetism, Magnetic Storms, Magnetospheric Instability, Auroral Electrojets, Kinetic Energy, Ring Currents, Solar Terrestrial Interactions, Solar Wind
Scientific paper
Time variations of the total magnetospheric output U(T) and the two geomagnetic indices AE and Dst during the magnetospheric storm of 31 December 1967-1 January 1968 are examined. A unique feature of this particular storm is that the solar-wind magnetosphere dynamo power epsilon was nearly constant for about 24 h by maintaining a high value of about 10 to the 19th ergs/s. It is found that U(T) was also nearly constant during that period, indicating that the magnetosphere is primarily a directly driven system. However, during an early epoch of the storm, the electrojet intensity levelled off, while the ring current began to grow during the same epoch. Subsequently, there occurred a sudden surge of the electrojet intensity, while the growth of the ring-current levelled off. Later variations of both the AE and Dst indices were very complex. After the surge, the AE index continued to decline and became as low as about 250 nT during the maximum epoch of this major storm (when the Dst decrease attained the maximum values). This trend can also be seen in many other major storms, but is often masked by changes of epsilon. One possible cause for such features for a dynamo power of at least 10 to the 19th ergs/s is that neutral wind is generated by the (E x B) motion in the lower ionosphere, reducing the electrojet intensity and enhancing the ring-current particle-injection rate.
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