letter to the editor: electric field fluctuations (25-35 min) in the midnight dip equatorial ionosphere

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ID: 150036
2000
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Abstract
Measurements with a HF Doppler sounder at Kodaikanal (10.2°N, 77.5°E, geomagnetic latitude 0.8°N) showed conspicuous quasi-periodic fluctuations (period 25-35 min) in F region vertical plasma drift, Vz in the interval 0047-0210 IST on the night of 23/24 December, 1991 (Ap = 14, Kp < 4-). The fluctuations in F region vertical drift are found to be coherent with variations in Bz (north-south) component of interplanetary magnetic field (IMF), in geomagnetic H/X components at high-mid latitude locations both in the sunlit and dark hemispheres and near the dayside dip equator, suggestive of DP2 origin. But the polarity of the electric field fluctuations at the midnight dip equator (eastward) is the same as the dayside equator inferred from magnetic variations, contrary to what is expected of equatorial DP2. The origin of the coherent occurrence of equatorial electric field fluctuations in the DP2 range of the same sign in the day and night hemispheres is unclear and merits further investigations.

Key words: Ionosphere (electric fields and currents; equatorial ionosphere; ionosphere-magnetosphere interactions)
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sastri2000annalesletter Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;J. Hanumath Sastri;J. Hanumath Sastri;J. Hanumath Sastri;H. Luhr;H. Luhr;H. Luhr;H. Tachihara;H. Tachihara;H. Tachihara;T.-I. Kitamura;T.-I. Kitamura;T.-I. Kitamura;J. V. S. V. Rao;J. V. S. V. Rao;J. V. S. V. Rao
Journal journal of food measurement and characterization
Year 2000
DOI
10.1007/s00585-000-0252-2
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