Statistical study of the DP2 enhancement at the dayside dip-equator compared to low latitudes
It has been largely investigated and established that the DP2 events are enhanced at dip-equator compared to low latitudes. Studies by several authors showed various enhancement ratio values of DP2 amplitude at the dayside dip-equator relative to those at low latitudes. In order to quantify this...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2011-12-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/2225/2011/angeo-29-2225-2011.pdf |
| Summary: | It has been largely investigated and established that the DP2 events are
enhanced at dip-equator compared to low latitudes. Studies by several authors
showed various enhancement ratio values of DP2 amplitude at the dayside
dip-equator relative to those at low latitudes. In order to quantify this
enhancement ratio, we carried out a statistical study on this phenomenon
using the ground magnetometer data at locations ranging from polar cap to
dip-equator over the African, Asian and American sector. Our result gave an
enhancement ratio which shows a diurnal variation with a maximum value around
12:00 LT and is correlated with the regular variation of the geomagnetic
H-component. The longitudinal variation of the enhancement ratio of the DP2
exhibits high values over the American sector compared to Asian sector and
African sector which have lowest values. This longitudinal dependence is
similar to that of the equatorial electrojet magnetic effect. |
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| ISSN: | 0992-7689 1432-0576 |