Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11305311t&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A5, CiteID A05311
Physics
29
Ionosphere: Electric Fields (2712), Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Storms (7949), Magnetospheric Physics: Magnetic Storms And Substorms (7954), Interplanetary Physics: Interplanetary Magnetic Fields
Scientific paper
We explore the ionospheric effects of prompt penetration electric fields (PPEFs) for a variety of interplanetary magnetic field directions. We use the great magnetic storm of 30-31 October as an example of PPEF effects. For intense southward interplanetary magnetic fields (IMFs), inward plasma sheet convection occurs with the result of magnetospheric ring current formation and an intense magnetic storm. Concurrent with the above, positive phase ionospheric storms occur in the dayside, and negative phase ionospheric storms occur on the nightside, the topics of this paper. The dayside ionospheric storms due to PPEFs are characterized by transport of near-equatorial plasma to higher altitudes and latitudes, forming a giant plasma fountain. These features are part of what is called the dayside ionospheric superfountain (DIS). For these southward IMFs, dusk and dawn plasma are predicted to be transported toward the dayside. For northward IMFs, negative phase ionospheric storms are expected on the dayside if the PPEFs indeed reach that region of space. IMF By components are expected to have weak or neglible ionospheric effects. On the basis of PPEF arguments, intervals of IMF By should not be related to geomagnetic storms (they are not). IMF By intervals should, however, cause a shearing of the magnetotail, a feature that has been previously reported in the literature.
Abdu Mangalathayil Ali
Araki Takeo
Gonzalez Walter D.
Lakhina Gurbax S.
Mannucci Anthony J.
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