Manifestations of minor and final stratospheric warmings in the MLT and F2-region

Irina Medvedeva; Konstantin Ratovsky

doi:10.1117/12.2287172

30 November 2017 Manifestations of minor and final stratospheric warmings in the MLT and F2-region

Irina Medvedeva, Konstantin Ratovsky

Proceedings Volume 10466, 23rd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 104665U (2017) https://doi.org/10.1117/12.2287172
Event: XXIII International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2017, Irkutsk, Russian Federation

Abstract

We present the results of studying the state of the neutral upper atmosphere and the ionosphere over the Eastern Siberia region during minor winter sudden stratosphere warming (SSW) in early February, 2016 and final stratospheric warming in early March, 2016. We used the data from spectrometric measurements of OH (~87 km, 834.0 nm, (6-2)) and At O₂ (~94 km, 864.5 nm, (0-1)) emissions from the Geophysical Observatory at the Institute of Solar-Terrestrial Physics SB RAS (51.8°N, 103.1°E, Tory). We also used the vertical sounding data on the peak electron density (NmF2), and on the peak height (hmF2). These data were obtained with the DPS-4 Irkutsk ionosonde (52.3°N, 104.3°E). For the analysis, we also involved the MLS Aura satellite data of measuring vertical temperature profiles and the MERRA reanalysis data. We found the MLT and ionospheric signatures for both analyzed SSWs. At MLT heights, a significant increase in the OH and O₂ emission intensities, a decrease in the atmosphere temperature, and an increase in wave activity were found. In the F2-region, we revealed significant (up to ~80 %) NmF2 positive disturbances in the postmidnight hours, which are not associated with geomagnetic activity variations. The revealed effects can be caused by the intensification of the activity of atmospheric waves and the enhancement of vertical transport of atmospheric components caused by stratospheric warmings.

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Irina Medvedeva and Konstantin Ratovsky "Manifestations of minor and final stratospheric warmings in the MLT and F2-region", Proc. SPIE 10466, 23rd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 104665U (30 November 2017); https://doi.org/10.1117/12.2287172

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KEYWORDS

Stratosphere

Airglow

Spectroscopy

Atmospheric propagation

Physics

Satellites

Thermosphere

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