Low-latitude particle precipitation and associated local magnetic disturbances

Details Low-latitude particle precipitation and associated local magnetic disturbances Low-latitude particle precipitation and associated local magnetic disturbances

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4041r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4041-4052.

Physics

11

Auroral Zones, Ionospheric Disturbances, Magnetic Disturbances, Particle Precipitation, Ring Currents, Data Correlation, Geomagnetism, Light Emission, Magnetic Signatures

Scientific paper

The paper investigates the O(+) ion and NO(+) ion temperature and temperature anisotropy for a spatially homogeneous auroral F region in the presence of large electric fields perpendicular to the geomagnetic field. The maximum optical emissions at midlatitudes occur in concert with the maximum positive (northward) excursions in the H trace and with rapid fluctuations in the D trace of nearby magnetograms. The source of the particles is inferred to be the ring current, with precipitation occurring when the Dst index is large at the time of the large short-term excursions in the local magnetic field. This result is consistent with the finding of Voss and Smith (1979), derived from a series of rocket measurements of precipitating heavy particles, that the flux correlates better with the product of Dst and the exponential of Kp than with either alone. It is shown that the product of Dst and the amplitude of the short-term excursions in the horizontal component in local magnetograms has better time resolution and better correlation with the observed emission rates than the index using Kp.

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