Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8908a&link_type=abstract
American Astronomical Society Meeting 210, #89.08; Bulletin of the American Astronomical Society, Vol. 39, p.203
Astronomy and Astrophysics
Astronomy
Scientific paper
Geomagnetic storms produce magnetic disturbances by way of current systems in the magnetosphere-a region in which Earth’s magnetic field is dominant. The system we are interested in is called the ring current. It is composed primarily of ions and situated between 2-8 Earth radii above the equator. In order to study the strength of the ring current, measurements are taken on ground magnetometers that measure the perturbation of Earth’s magnetic field at the equator. Recent work has also used direct particle measurements to calculate the energy of the ring current for comparison to the ground magnetometer-derived Disturbance Storm Time (Dst) index. Turner et al. [2001] found a contribution of about half the Dst index is due to energy of the ring current particles. We are expanding on these studies by analyzing the contribution to Dst index during different phases of storms using data taken by ground magnetometers as well as POLAR satellite data for in situ measurements to compare to the ring current energy. In the comparison of both sets of data, we determine how much of the measured Dst is due to the ring current. We separate each storm into main phase and recovery phase and determine the coupling coefficient between Dst and ring current for each phase. We then show how much the ring current contributes to the Dst during each phase.
Alzate Nathalia
Cramer Douglas W.
DuBois A. M.
Turner Niescja Evonne
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