Japan Geoscience Union Meeting 2015

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International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM09] Dynamics in magnetosphere and ionosphere

Wed. May 27, 2015 11:00 AM - 12:45 PM 302 (3F)

Convener:*Shin'ya Nakano(The Institute of Statistical Mathematics), Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University), Hiroshi Hasegawa(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Yoshimasa Tanaka(National Institute of Polar Research), Tomoaki Hori(Nagoya University Solar Terrestrial Environment Laboratory Geospace Research Center), Chair:Yoshizumi Miyoshi(Solar-Terrestrial Environement Laboratory, Nagoya University)

11:15 AM - 11:30 AM

[PEM09-02] Long-term trends in ionospheric parameters measured by the EISCAT radars

*Lindis merete BJOLAND1, Vasyl BELYEY1, Unni pia LOVHAUG1, HOZ, Cesar LA1 (1.Department of Physics and Technology, University of Tromso)

Incoherent scatter radar measurements are an important source for studies of ionospheric plasma parameters. Data from the EISCAT Svalbard Radar (ESR), which covers the polar cap and cusp, and the UHF and VHF radars, which cover the auroral zone, can be used to obtain information about the electron density, electron- and ion temperature, and line-of-sight plasma velocity from an altitude of about 50 and up to above 1600 kilometers. As the ESR radar has been operational since 1996 and the UHF and VHF radars since the early 1980s, the accumulated database covers more than one solar cycle in the polar cap and cusp and several solar cycles in the auroral zone.

Results from the study of long-term trends in the ionospheric parameters both from the ESR and UHF/VHF will be shown and a comparison with the IRI-model will be discussed.