Conjunction study of plasmapause location using ground-based magnetometers, IMAGE-EUV, and Kaguya-TEX data

Details Conjunction study of plasmapause location using ground-based magnetometers, IMAGE-EUV, and Kaguya-TEX data Conjunction study of plasmapause location using ground-based magnetometers, IMAGE-EUV, and Kaguya-TEX data

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11506208o&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A6, CiteID A06208

Physics

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Magnetic Storms And Substorms (7954), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

A statistical study comparing the plasmapause location determined using extreme ultraviolet (EUV) and cross-phase measurements was performed over 50 days in May-July 2000 and 1 day in May 2008. In EUV images the plasmapause location was estimated using the sharp gradient in the brightness of 30.4 nm He+ emission. We have taken EUV images obtained by the IMAGE and the Kaguya satellites, which were operated in a solar maximum and minimum periods, respectively. In the ground-based cross-phase measurement, the plasmapause was defined as a steep drop of mass density in its radial profile. Mass density was inferred from the eigenfrequency of field line resonances in the ULF band (˜1-1000 mHz), which was deduced from geomagnetic field data using cross-phase analysis. The two measurements of the plasmapause have been compared in a same meridian at the same time and very good agreement was found in 18 of 19 events. Our result clearly indicates that the He+ and mass density plasmapause are usually detected at the same place with the error range of ± 0.4 RE. In only one event, the He+ and the mass density defined plasmapauses were not colocated. This event may be due to the difference of refilling time between He+ and other dominant species.

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