Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1271k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1271-1277.
Physics
27
Equatorial Atmosphere, Magnetic Disturbances, Spread F, Atmospheric Models, F Region, Taylor Instability
Scientific paper
A numerical model is used to investigate electric field effects on the generation of equatorial spread F (ESF) in the postmidnight hours. The model calculation shows that the growth rate becomes significant when the electric field reverses eastward and may remain so even when the electric field disturbance weakens due to the upward altitude excursion of the layer. These results account for the correlation of ESF occurrence and high Kp values in the postmidnight hours when taken in conjunction with the characteristics of the penetration of magnetospheric electric fields during such magnetic activity. The crucial role of layer height in the physics is also highlighted. The growth rates for specific nights in which perturbation of electric fields and plumes were observed at Jicamarca are calculated. It is suggested that a quantitative requirement for the generation of plumes is that about 10 e-folding times of the linear instability growth occur.
Kelley Michael C.
Maruyama Takashi
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