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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 4
Ann. Geophys., 31, 689–695, 2013
https://doi.org/10.5194/angeo-31-689-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 31, 689–695, 2013
https://doi.org/10.5194/angeo-31-689-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 17 Apr 2013

Regular paper | 17 Apr 2013

The mechanism of mid-latitude Pi2 waves in the upper ionosphere as revealed by combined Doppler and magnetometer observations

V. A. Pilipenko1,2, E. N. Fedorov3, M. Teramoto2, and K. Yumoto4 V. A. Pilipenko et al.
  • 1Space Research Institute, Moscow, Russian Federation
  • 2Solar-Terrestrial Environment Laboratory, Nagoya University, Japan
  • 3Institute of Physics of the Earth, Moscow, Russian Federation
  • 4International Center for Space Weather Science and Education, Kyushu University, Fukuoka, Japan

Abstract. The interpretation of simultaneous ionospheric Doppler sounding and ground magnetometer observations of low-latitude Pi2 waves is revised. We compare the theoretical estimates of the ionospheric Doppler velocity for the same amplitude of the ground magnetic disturbances produced by a large-scale compressional mode and an Alfvén mode. The plasma vertical displacement caused by the wave electric field is shown to be the dominating effect. Taking into account the correction of the previous paper, the observations of low-latitude Pi2 in the F layer ionosphere by Doppler sounding and SuperDARN (Super Dual Auroral Radar Network) radars give consistent results. We suggest that the Doppler response to Pi2 waves is produced by the Alfvén wave component, but not the fast-mode component, whereas the ground magnetic signal is composed from both Alfvén and fast magnetosonic modes.

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