Longitudinal variations in thermospheric parameters under summer noontime conditions inferred from ionospheric observations: A comparison with empirical models.
Sci Rep 2019;
9:12763. [PMID:
31484974 PMCID:
PMC6726631 DOI:
10.1038/s41598-019-49255-1]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 08/19/2019] [Indexed: 12/02/2022] Open
Abstract
Longitudinal variations in the thermospheric neutral composition ([O] and [N2]) and exospheric temperature Tex have been inferred from June monthly median noontime foF1 and foF2 observations at mid-latitudes to check for consistency with empirical MSIS models. In general, a similarity in longitudinal variations has been demonstrated, and this is interesting, as similar variations were obtained with very different methods and different data sources. Both inferred and MSISE-00 modelled height-integrated O/N2 ratios are comparable to TIMED/GUVI observations only under solar minimum conditions but differ substantially under high solar activity. The retrieved height-integrated O/N2 ratio longitudinal variations are small (∼15%) in comparison to the observed NmF2 variations under high solar activity. The height-integrated O/N2 ratio cannot be incorporated into the F2-layer formation mechanism; therefore, such observations cannot be used for any quantitative interpretation of NmF2 variations.
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