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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 19, issue 3
Ann. Geophys., 19, 389–393, 2001
https://doi.org/10.5194/angeo-19-389-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 19, 389–393, 2001
https://doi.org/10.5194/angeo-19-389-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Mar 2001

31 Mar 2001

Letter to the Editor
Low-frequency electric field fluctuations and field-aligned electron beams around the edge of an auroral acceleration region

W. Miyake1, R. Yoshioka2, A. Matsuoka2, T. Mukai2, and T. Nagatsuma3 W. Miyake et al.
  • 1Communications Research Laboratory, 4–2–1, Nukui-kita, Koganei, Tokyo 184–8795, Japan
  • 2Institute of Space and Astronautical Science, 3–1–1, Yoshinodai, Sagamihara 229–8510, Japan
  • 3Hiraiso Solar Terrestrial Research Center, CRL, 3601 Isozaki, Hitachi-naka 311–1202, Japan
  • Correspondence to: W. Miyake (miyake@crl.go.jp)

Abstract. Electron beams narrowly collimated to the magnetic field line were observed continuously from a down-ward current region to an auroral acceleration region (i.e., upward current region). They were well correlated with low-frequency electric field fluctuations in the auroral acceleration region as well as in the adjacent downward current region. Magnetic field fluctuations were found only in the downward current region. The analysis suggests that static field-aligned electric fields are not fully responsible for the filed-aligned electron acceleration; the ac electric field, presumably associated with Alfvenic fluctuations, should also be involved in the acceleration of ionospheric electrons.

Key words. Ionosphere (particle acceleration) – Magnetospheric physics (auroral phenomena; magnetosphere-ionosphere interactions)

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