Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf....7s&link_type=abstract
10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io
Astronomy and Astrophysics
Astronomy
Scientific paper
Geomagnetic pulsations of Ultra Low Frequency (ULF waves) are large-scale oscillations in the Earth's magnetosphere with frequencies roughly 1 mHz to 1 Hz. They are often observed by orbiting spacecraft as well as by ground-based magnetometers, and their source of excitation has been studied from the early days of space exploration, both through modeling and observation; however positively identifying their excitation mechanism has proven to be a difficult task. This is primarily due to limitations in observation, which have mostly come from single- or two-point measurements in space, at times with limited instrumentation, or from orbits that provide ambiguous measurements of ULF waves; ground magnetometers also have limitations, as some ULF waves are screened and/or altered by the ionosphere. We will present how we used multi-point measurements from the recent THEMIS constellation of spacecraft as well as from GEOTAIL and GOES satellites combined with ground magnetometers to identify the extent and excitation mechanism of ULF field line resonances in the magnetosphere and we will explore cases that demonstrate the nature of the solar wind influence in ULF wave activity in the magnetosphere.
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