ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 4, pp. 204-215

Spatial variations of the ionosphere parameters over the Northern Hemisphere winter jet streams

B.G. Shpynev 1 , M.A. Chernigovskaya 1 , V.I. Kurkin 1 , K.G. Ratovsky 1 , A.Yu. Belinskaya 2 , A.E. Stepanov 3 , V.V. Bychkov 4 , S.A. Grigorieva 5 , V.A. Panchenko 6 , N.A. Korenkova 7 , V.S. Leschenko 7 , J. Mielich 8 
1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
2 Geophysical Survey SB RAS, Altay-Sayan Dept., Novosibirsk, Russia
3 Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia
4 Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, Paratunka, Russia
5 Institute of Geophysics UB RAS, Yekaterinburg, Russia
6 N.V. Pushkov Institute of Terrestrial Magnetism and Radio Wave Propagation RAS, Moscow, Russia
7 West Department of N.V. Pushkov Institute of Terrestrial Magnetism and Radio Wave Propagation RAS, Kaliningrad, Russia
8 Leibniz Institute for Atmospheric Physics, Kühlungsborn, Germany
Accepted: 27.08.2016
DOI: 10.21046/2070-7401-2016-13-5-204-215
We study the effects of neutral atmosphere dynamics influence on midlatitude and sub-polar ionosphere during the formation and evolution of the winter jet stream at the heights of the stratosphere/lower mesosphere in the Northern Hemisphere during years 2008-2013. To analyze the dynamics of the stratosphere/lower mesosphere jet streams we use the ECMWF Era-Interim reanalysis data. The analysis of the global ionosphere response to the strato-mesospheric dynamics is based on the data of the ionosonde chain located within the latitude range of 50-60 N in the longitudinal sector 0-158 E spaced at 15-20 degrees in longitude and covering the entire Eurasian continent. We reveal the regional features of the F2-layer ionosphere response to the dynamic processes during the developing of winter circumpolar vortex at the strato-mesosphere. As a mechanism of the neutral atmosphere impact to the ionosphere, we consider the uplifting/lowering molecular gas to/from lower thermosphere in active regions of circulations. Irregular variations of the ionosphere parameters can also be caused by wave disturbances of various spatial and temporal scales (including internal gravity waves) propagating in the thermosphere from the lower atmosphere. The source of the mesoscale waves generation at the strato-mesosphere heights is associated with the baroclinic instabilities in the spatially non-uniform, high-speed winter jet stream. We identify the periods of middle-scale wave-like motions in the atmosphere and ionosphere in the autumn-winter period (between November and February) for all years under analysis. Variations of the ionosphere parameters observed at different longitudes of the northern hemisphere significantly depend on the ionosonde position relatively to the winter jet stream zone in the strato-mesosphere. The difference in the critical frequency values for the ionosondes spaced longitudinally by only 15-20 degrees can reach about 1.5-2 MHz, depending on the location of the observation point under the jet stream or outside it.
Keywords: the upper and middle atmosphere, interaction between atmospheric layers, wave disturbances
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