Sudden commencement event of 17 April 2002: Aspects of the geomagnetic response at low latitudes

Details Sudden commencement event of 17 April 2002: Aspects of the geomagnetic response at low latitudes Sudden commencement event of 17 April 2002: Aspects of the geomagnetic response at low latitudes

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11012s23v&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A12, CiteID A12S23

Physics

1

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409)

Scientific paper

An analysis of a sudden commencement (SC) manifestation reveals a significant contribution of the polar current system which influences the long-term behavior of the H component at low-latitude ground stations located in the subsolar sector. A transition between ``morning'' and ``afternoon'' characteristics of the geomagnetic response occurs at ~1300 MLT. ``Morning'' events are characterized by a positive then negative variation (P/N) preceding the longer-term variation and show a gentle latitudinal decrease of the asymptotic response; conversely, ``afternoon'' events, which are characterized by a N/P structure, show a steep latitudinal gradient. PPI and PRI structures are observed on opposite sides of the ~1300 MLT boundary. The PPI consists of three dominant fluctuations at well-defined frequencies and the small differences in the signal manifestation at nearby stations can be imputed to the occurrence of local resonance phenomena. Large-amplitude pulsations appear soon after the SC occurrence at subauroral latitudes.

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