A comparison of EISCAT and HF Doppler observations of a ULF wave

Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric sig...

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Bibliographic Details
Published in:Annales Geophysicae
Main Authors: Wright, D. M., Yeoman, Tim K., Davies, J. A.
Format: Article in Journal/Newspaper
Language:English
Published: European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) 2015
Subjects:
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Geosciences
Multidisciplinary
Meteorology & Atmospheric Sciences
Geology
magnetosphere-ionosphere interactions
MHD waves and instabilities
radio science
ionospheric physics
FIELD LINE RESONANCES
GEOMAGNETIC-PULSATIONS
HYDROMAGNETIC-WAVES
IONOSPHERIC DOPPLER
RADAR OBSERVATIONS
RESOLUTION OBSERVATIONS
OSCILLATIONS
PC3-4
MICROPULSATION
MAGNETOSPHERE
Norway
Leicester
Ramfjordmoen
Seljelvnes
EISCAT
Northern Norway
Online Access:http://www.ann-geophys.net/16/1190/1998/angeo-16-1190-1998.html
http://hdl.handle.net/2381/31884
https://doi.org/10.1007/s00585-998-1190-7
Description
Summary:Since the middle of 1995, an HF Doppler sounder has been running almost continuously in northern Norway, with the receiver at Ramfjordmoen and the transmitter at Seljelvnes. Concurrent operation of the EISCAT UHF radar in common programme (CP-1) mode has made it possible to study the ionospheric signature of a magnetospheric ULF wave. These are the first results of such wave signatures observed simultaneously in both instruments. It has been demonstrated that the observed Doppler signature was mainly due to the vertical bulk motion of the ionosphere caused by the electric field perturbation of the ULF wave and the first direct observational confirmation of a numerical simulation has been achieved. The wave, which was Alfvénic nature, was detected by the instruments 8° equatorward of the broad resonance region. The implications for the deduced wave modes in the ionosphere and the mechanism producing the HF Doppler variations are discussed. Royal Society for funding the initial construction of the DOPE project and the Particle Physics and Astronomy Research Council for support during the work presented in this paper Peer-reviewed Publisher Version 8th EISCAT Scientific Workshop, UNIV LEICESTER, LEICESTER, ENGLAND

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