Ionospheric Disturbances during Meteorological Storms
- PDF / 1,224,067 Bytes
- 8 Pages / 612 x 792 pts (letter) Page_size
- 62 Downloads / 177 Views
spheric Disturbances during Meteorological Storms M. I. Karpova, b, I. V. Karpova, b, *, O. P. Borchevkinaa, b , G. A. Yakimovaa, and N. A. Korenkovaa aKaliningrad
Branch, Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Kaliningrad, 236035 Russia b Immanuel Kant Baltic Federal University, Kaliningrad, 236016 Russia *e-mail: [email protected] Received December 26, 2019; revised March 13, 2020; accepted May 21, 2020
Abstract—Ionospheric disturbances during meteorological storms in the Kaliningrad region with a wind amplification of 8 points or higher on the Beaufort scale for the period 2010–2018 are analyzed. Ionospheric observations made under conditions of low geomagnetic activity are considered. Analysis shows that all of the selected events were accompanied by disturbances of the total electron content (TEC) and/or the electron concentration at the maximum of the F2 layer ionosphere (foF2) a few hours after reaching the maximum in the surface wind speed. Moreover, in four of six cases, the disturbances exceed the standard deviation of the values from the average median values by two times. Negative disturbances of TEC and foF2 (decrease in values) were observed in four cases, and positive disturbances (an increase in TEC and foF2) were observed in two cases. Disturbances were observed for at least 3 h, mainly in the daytime. The relative disturbances of the TEC due to meteorological storms exceed the corresponding foF2 disturbances. DOI: 10.1134/S0016793220050102
1. INTRODUCTION The passage of atmospheric fronts, the formation of cyclones and anticyclones, and the formation of mesoscale turbulence, jet streams, and other meteorological processes in the lower atmosphere are sources of the generation of acoustic-gravitational waves (AGWs) (Medvedev and Gavrilov, 1995; Fritz and Alexander, 2003; Plougonven and Snyder, 2007; Plougonven and Zhang, 2014). As AGWs propagate from a surface source, their amplitude increases due to a decrease in density with increasing height. Dissipation processes, to a large extent, determine the possibilities of vertical wave propagation and the height to which an atmospheric wave can propagate. Theoretical studies show that meteorological sources excite relatively short-period AGWs (Snively and Pasko, 2003). Infrasonic waves and AGWs with periods close to the Väisälä–Brent period, propagating from the excitation region almost vertically, can reach the heights of the thermosphere and ionosphere (Schubert et al., 2005). The dissipation of such waves leads to the formation of local heating regions of the thermosphere, which affects the dynamics and ionization–recombination processes of the ionosphere (Karpov and Kshevetsky, 2014; Karpov and Kshevetskii, 2017). Experimental studies of the state and dynamics of the ionosphere over the areas of the development of extreme meteorological events, such as hurricanes and typhoons, demonstrate the formation of various kinds of effects, including moving ionospheric disturbances
(MIDs), dis
Data Loading...
