Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51b..11v&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM51B-11
Physics
2784 Solar Wind/Magnetosphere Interactions
Scientific paper
As extensively discussed in the scientific literature, on May 10-12, 1999 a prolonged interval of extremely low solar wind density led to an huge distension of the Earth's magnetosphere. We discuss some aspects of the geomagnetic response to the variable SW conditions that were observed on May 12, i.e. in the recovery phase of the SW density. In particular, we focused attention on a 50 min interval characterized by explicit variations of the SW pressure, and on a sudden impulse observed at ground stations located between low and subauroral latitudes (20o- 65o), in the Northern hemisphere. The experimental observations confirm a strong morning/afternoon asymmetry in ground observations, and sharp differences in the geomagnetic response appear in the prenoon quadrant, across a LT dependent separation line which approximately extends between (30o, 6 LT) and (60o, 13 LT). These results suggest that ionospheric contributions might extend to a portion of the prenoon sector larger than predicted, where also suppress the correspondence between the magnetospheric field magnitude and the H component. The geomagnetic response is larger in the afternoon sector: its latitudinal dependence explicitly emerges in this sector while vanishes in the morning sector.
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