Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.490 IF 1.490
  • IF 5-year value: 1.445 IF 5-year
    1.445
  • CiteScore value: 2.9 CiteScore
    2.9
  • SNIP value: 0.789 SNIP 0.789
  • IPP value: 1.48 IPP 1.48
  • SJR value: 0.74 SJR 0.74
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 88 Scimago H
    index 88
  • h5-index value: 21 h5-index 21
Volume 28, issue 2
Ann. Geophys., 28, 449–454, 2010
https://doi.org/10.5194/angeo-28-449-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 449–454, 2010
https://doi.org/10.5194/angeo-28-449-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Feb 2010

08 Feb 2010

Relationships between pre-sunset electrojet strength, pre-reversal enhancement and equatorial spread-F onset

J. Uemoto1, T. Maruyama1, S. Saito2, M. Ishii1, and R. Yoshimura3 J. Uemoto et al.
  • 1National Institute of Information and Communications Technology, Tokyo, Japan
  • 2Electronic Navigation Research Institute, Tokyo, 182-0012, Japan
  • 3Kitasato University, Kanagawa, 228-8555, Japan

Abstract. The virtual height of the bottom side F-region (h'F) and equatorial spread-F (ESF) onsets at Chumphon (10.7° N, 99.4° E; 3.3° N magnetic latitude) were compared with the behaviour of equatorial electrojet (EEJ) ground strength at Phuket (8.1° N, 98.3° E; 0.1° N magnetic latitude) during the period from November 2007 to October 2008. Increase in the F-layer height and ESF onsets during the evening hours were well connected with the EEJ ground strength before sunset, namely, both the height increase and ESF onsets were suppressed when the integrated EEJ ground strength for the period from 1 to 2 h prior to sunset was negative. The finding suggests observationally that the pre-sunset E-region dynamo current and/or electric field are related to the F-region dynamics and ESF onsets around sunset.

Publications Copernicus
Download
Citation