Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.118k&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
There is a need for modeling ionospheric sheet currents locally, over a certain region using ground based and/or satellite observations to help us better understand the physics of changes happening during geomagnetic storms. Our interest is to investigate storm-time changes in the low-latitude ionosphere, by taking into account the coupling between high- and low- latitudes. We use magnetic data from the 210 degree meridian chain and calculate the ionospheric (~120km) sheet currents for geomagnetic storms of varying intensities, spanning different seasons and solar cycle. Many factors contribute differently to the observed H component variations and one needs to address those using case-based arguments, since quantifying them is difficult task. We separate the observed H-component into external and internal parts and then continue the external component towards the source to arrive at the ionospheric equivalent currents. It is also hoped to discuss the storm-time dynamics and the associated changes in the low- latitude ionosphere using the derived electrodynamic parameters (conductivities, electric fields) which are then input to an existing numerical model of the ionosphere. We hope that the application of the algorithm to different meridional chains (accounting for the interpretation of conductivity interdisciplinary (magnetotellurics) - and wavelengths in the spatial domain) will facilitate and further our understanding of these non- linear phenomena and positively contribute towards the basic space science activities of the upcoming IHY.
Fukunishi Hiroshi
Kombiyil R.
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