Season, local time, and longitude variations of electron temperature at the height of ∼ 600 km in the low latitude region

Oyama Koichiro, S. Watanabe, Y. Su, T. Takahashi, K. Hirao

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Electron temperature observed at the height of ∼600 km by the low inclination satellite Hinotori was studied in terms of local time, season, latitude, magnetic declination and solar flux intensity. The electron temperature shows a steep rise in the early morning (well known as "morning overshoot"), a decrease after that and again an increase at ∼18 hours (hereafter named "evening overshoot"). Generally the morning overshoot becomes more enhanced in the winter hemisphere and during higher solar flux. The evening overshoot becomes more pronounced in the higher latitudes in all seasons and more enhanced in the winter hemisphere as similar to the morning overshoot. These two overshoots show a slight difference in the 210° -285° and 285° -360° longitude sectors. This is most likely due to the difference in magnetic declination of these two zones and the resulting difference in the effect of the zonal neutral wind on the thermal structure in the low latitude ionosphere. Significant difference exists between IRI and the observation during daytime.

Original languageEnglish
Pages (from-to)269-278
Number of pages10
JournalAdvances in Space Research
Volume18
Issue number6
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

morning
Electron temperature
longitude
tropical regions
magnetic declination
electron energy
Fluxes
electron
solar flux
evening
declination
Ionosphere
hemispheres
winter
temperature
Satellites
thermal structure
zonal wind
ionosphere
daytime

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

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abstract = "Electron temperature observed at the height of ∼600 km by the low inclination satellite Hinotori was studied in terms of local time, season, latitude, magnetic declination and solar flux intensity. The electron temperature shows a steep rise in the early morning (well known as {"}morning overshoot{"}), a decrease after that and again an increase at ∼18 hours (hereafter named {"}evening overshoot{"}). Generally the morning overshoot becomes more enhanced in the winter hemisphere and during higher solar flux. The evening overshoot becomes more pronounced in the higher latitudes in all seasons and more enhanced in the winter hemisphere as similar to the morning overshoot. These two overshoots show a slight difference in the 210° -285° and 285° -360° longitude sectors. This is most likely due to the difference in magnetic declination of these two zones and the resulting difference in the effect of the zonal neutral wind on the thermal structure in the low latitude ionosphere. Significant difference exists between IRI and the observation during daytime.",
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Season, local time, and longitude variations of electron temperature at the height of ∼ 600 km in the low latitude region. / Koichiro, Oyama; Watanabe, S.; Su, Y.; Takahashi, T.; Hirao, K.

In: Advances in Space Research, Vol. 18, No. 6, 01.01.1996, p. 269-278.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Season, local time, and longitude variations of electron temperature at the height of ∼ 600 km in the low latitude region

AU - Koichiro, Oyama

AU - Watanabe, S.

AU - Su, Y.

AU - Takahashi, T.

AU - Hirao, K.

PY - 1996/1/1

Y1 - 1996/1/1

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AB - Electron temperature observed at the height of ∼600 km by the low inclination satellite Hinotori was studied in terms of local time, season, latitude, magnetic declination and solar flux intensity. The electron temperature shows a steep rise in the early morning (well known as "morning overshoot"), a decrease after that and again an increase at ∼18 hours (hereafter named "evening overshoot"). Generally the morning overshoot becomes more enhanced in the winter hemisphere and during higher solar flux. The evening overshoot becomes more pronounced in the higher latitudes in all seasons and more enhanced in the winter hemisphere as similar to the morning overshoot. These two overshoots show a slight difference in the 210° -285° and 285° -360° longitude sectors. This is most likely due to the difference in magnetic declination of these two zones and the resulting difference in the effect of the zonal neutral wind on the thermal structure in the low latitude ionosphere. Significant difference exists between IRI and the observation during daytime.

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