Diurnal variation of the ion temperature

Mahajan, K. K. (1969) Diurnal variation of the ion temperature Journal of Atmospheric and Terrestrial Physics, 31 (1). pp. 93-101. ISSN 0021-9169

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0021-9169(69)90084-1


Results on the diurnal variation of the ion temperature, obtained from the Thomson scatter spectra at Arecibo, in the height range 250-475 km are presented. At 250 km where the ion temperature (Ti) is expected to be nearly equal to the neutral temperature (Tn, Ti is generally observed to show diurnal maximum at 16 hr L.T. and diurnal minimum at 4 hr L.T., with no appreciable change in these times with solar activity. The average day to night Ti ratio at 250 km is found to be 1.45. These results are in apparent conflict with the satellite drag analysis in which Tn is found to have a diurnal maximum at 14 hr L.T. and day to night temperature ratio around 1.30. At 475 km where Ti, is significantly above Tn, the diurnal behavior of Ti is observed to be different on different days. The day-to-day and hour-to-hour variations in Ti at this height are found to be due to changes in the electron density and electron temperature and seem consistent in terms of an energy budget that includes heating of the ion gas by the hotter thermal electrons and cooling by the neutral atmosphere.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:75759
Deposited On:27 Dec 2011 12:35
Last Modified:27 Dec 2011 12:35

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