Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13b..08m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA13B-08
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2441] Ionosphere / Ionospheric Storms
Scientific paper
At the longitudes of the dipole tilt, the ionosphere experiences a blend of processes governed by the difference (D) between geomagnetic and geographic latitudes. Magnetosphere-ionosphere coupling is maximized where D is most positive and solar induced photo-chemical processes are strongest where D is most negative. The Dmax cases occur in the North American Atlantic sector and in the Australian sector in the southern hemisphere. At these locations, coupling effects caused by penetration electric fields produce extreme examples of positive phase ionospheric storms. We have studied 206 ionospheric storm periods during solar cycle #20 (1964-1976) using ionosonde data from Wallops Island (VA) and Hobart (Tasmania), augmented by additional observations made in Christchurch (New Zealand). We find that the average patterns of the “dusk effect” that occur early in an ionospheric storm occur consistently at geophysically-equivalent sites with magnitudes that scale with the difference between geomagnetic and geographic latitudes.
Mendillo Michael
Narvaez C. L.
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