Monitoring the Dynamics of the Ionosphere-Plasmasphere System by Ground-Based ULF Wave Observations

Details Monitoring the Dynamics of the Ionosphere-Plasmasphere System by Ground-Based ULF Wave Observations Monitoring the Dynamics of the Ionosphere-Plasmasphere System by Ground-Based ULF Wave Observations

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009em%26p..104...25v&link_type=abstract

Earth, Moon, and Planets, Volume 104, Issue 1-4, pp. 25-27

Computer Science

Sound

Ulf Waves, Field Line Resonance, Remote Sensing, Solar Activity, Plasmasphere, Ionosphere

Scientific paper

Cross-spectral analysis of ULF wave measurements recorded at ground magnetometer stations closely spaced in latitude allows accurate determinations of magnetospheric field line resonance (FLR) frequencies. This is a useful tool for remote sensing temporal and spatial variations of the magnetospheric plasma mass density. The spatial configuration of the South European GeoMagnetic Array (SEGMA, 1.56 < L < 1.89) offers the possibility to perform such studies at low latitudes allowing to monitor the dynamical coupling between the ionosphere and the inner plasmasphere. As an example of this capability we present the results of a cross-correlation analysis between FLR frequencies and solar EUV irradiance (as monitored by the 10.7-cm solar radio flux F10.7) suggesting that changes in the inner plasmasphere density follow the short-term (27-day) variations of the solar irradiance with a time delay of 1-2 days. As an additional example we present the results of a comparative analysis of FLR measurements, ionospheric vertical soundings and vertical TEC measurements during the development of a geomagnetic storm.

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