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Authors: Vellante, M.* 
Förster, M.* 
Pezzopane, M.* 
Jakowski, N.* 
Zhang, T. L.* 
Villante, U.* 
De Lauretis, M.* 
Zolesi, B.* 
Magnes, W.* 
Title: Monitoring the Dynamics of the Ionosphere–Plasmasphere System by Ground-Based ULF Wave Observations
Issue Date: Apr-2009
Series/Report no.: / 104 (2009)
DOI: 10.1007/s11038-008-9246-y
Keywords: ULF waves
Field line resonance
Remote sensing
Solar activity
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.02. Dynamics 
01. Atmosphere::01.02. Ionosphere::01.02.04. Plasma Physics 
01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
Abstract: 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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