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

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 18, issue 5
Ann. Geophys., 18, 511–516, 2000
https://doi.org/10.1007/s00585-000-0511-2
© European Geosciences Union 2000
Ann. Geophys., 18, 511–516, 2000
https://doi.org/10.1007/s00585-000-0511-2
© European Geosciences Union 2000

  31 May 2000

31 May 2000

The ionospheric footprint of antiparallel merging regions on the dayside magnetopause

I. J. Coleman, M. Pinnock, and A. S. Rodger I. J. Coleman et al.
  • British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
  • e-mail: ijc@bas.ac.uk
  • Correspondence to: I. J. Coleman

Abstract. The antiparallel merging hypothesis states that reconnection takes place on the dayside magnetopause where the solar and geomagnetic fields are oppositely directed. With this criterion, we have mapped the predicted merging regions to the ionosphere using the Tsyganenko 96 magnetic field model, distinguishing between regions of sub-Alfvénic and super-Alfvénic magnetosheath flow, and identifying the day-night terminator. We present the resulting shape, width and latitude of the ionospheric dayside merging regions in both hemispheres, showing their dependence on the Earth's dipole tilt. The resulting seasonal variation of the longitudinal width is consistent with the conjugate electric fields in the northern and southern cusps, as measured by the SuperDARN HF radars, for example. We also find a seasonal shift in latitude similar to that observed in satellite cusp data.

Key words: Ionosphere (ionosphere-magnetosphere interactions) · Magnetospheric physics (magnetopause · cusp and boundary layers; magnetosphere-ionosphere interactions)

Publications Copernicus
Download
Citation