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Theoretical simulation of O + and H + densities in the Indian low latitude F-region and comparison with observations

  • Bhuyan P
  • Kakoty P
  • Singh S
Annales Geophysicae (2002) 20(12) 1959-1966
DOI: 10.5194/angeo-20-1959-2002
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Abstract

Abstract. The O+ and H+ ion density distributions in the Indian low latitude F-region, within ± 15° magnetic latitudes, are simulated using a time dependent model developed on the basis of solution of the plasma continuity equation. The simulated ion densities for solar minimum June and December solstices are then compared with ionosonde observations from the period 1959–1979 and measurements made by the Indian SROSS C2 satellite during 1995–1996 at an altitude of ~ 500 km. The simulated O+ density has a minimum around pre-sunrise hours and a maximum during noontime. H+ density is higher at nighttime and lower during the day. The simulations reproduced the well-known equatorial ionization anomaly (EIA) observed in electron density at the peak of the F2-region in the Indian low latitude sector during solar minimum. In situ measurement of O+ density by the SROSS C2, however, showed a single peak of ionization around the equator.Key words. Ionosphere (equatorial ionosphere; modeling and forecasting)

Figures

  • Fig. 1. Diurnal variation of neutral wind velocity for December (top) and June solstice (bottom) at three fixed geomagnetic latitudes.
  • Fig. 2. Local time variation of equatorial vertical E×B drift velocity in December (top) and June solstice (bottom) over Trivandrum.
  • Fig. 3. Measured and simulated NmF2 (shown by dots and solid line, respectively) for selected locations along 75◦ E meridian. The dots are averages of all data for the December solstice solar minimum conditions during 1959–1979.
  • Fig. 4. Diurnal variation of measured (o) and simulated (—-) O+ density (a) and H+ density (b) at ∼ 500 km altitude in the Indian zone over the geomagnetic equator for the December solstice of solar minimum. Bars indicate standard deviation of hourly average data in log scale.
  • Fig. 5. Same as in Fig. 4 for 10◦ N geomagnetic latitude.
  • Fig. 6. Local time variation of measured (o) and simulated (—-) O+ density (a) and H+ density (b) at ∼500 km altitude in the Indian zone over the geomagnetic equator in the June solstice at solar minimum.
  • Fig. 7. Same as in Fig. 6 for 10◦ N geomagnetic latitude.
  • Fig. 8. Latitudinal and local time variation of observed (left panel) and simulated (right panel) O+ density at an altitude of ∼ 500 km within the geomagnetic latitude range from 10◦ S to 15◦ N during December solstice of low solar activity.

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CITATION STYLE

APA

Bhuyan, P. K., Kakoty, P. K., & Singh, S. B. (2002). Theoretical simulation of O + and H + densities in the Indian low latitude F-region and comparison with observations. Annales Geophysicae, 20(12), 1959–1966. https://doi.org/10.5194/angeo-20-1959-2002

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