Manifestations of field-aligned currents in tomographic observations of the ionospheric F region

  • Nygrén T
  • Tereshchenko E
  • Khudukon B
 et al. 
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Abstract

In November 1995, observations of the ionospheric F region were made in Scandinavia by means of a tomographic chain extending from the south of Finland to the north of Norway. These observations revealed F region structures which, using optical satellite images and ground-based magnetometer data, are interpreted as manifestations of field-aligned currents in the ionospheric F region electron density. A field-aligned plasma enhancement extending to about 700 km altitude is sometimes seen in connection with an upward current, whereas a larger plasma enhancement with an elevated F layer peak altitude is found to lie close to the region of downward current. (C) 2000 COSPAR. Published by Elsevier Science Ltd.

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Authors

  • T. Nygrén

  • E. D. Tereshchenko

  • B. Z. Khudukon

  • O. V. Evstafiev

  • M. S. Lehtinen

  • M. Markkanen

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