Response of migrating tides to the stratospheric sudden warming in 2009 and their effects on the ionosphere studied by a whole atmosphere‐ionosphere model GAIA with COSMIC and TIMED/SABER observations

Abstract

.[1] This paper compares results from a whole atmosphere-ionosphere coupled model, GAIA, with the COSMIC and TIMED/SABER observations during the 2008/2009 northern winter season. The GAIA model has assimilated meteorological reanalysis data by a nudging method. The comparison shows general agreement in the major features from the stratosphere to the ionosphere including the growth and decay of the major stratospheric sudden warming (SSW) event in 2009. During this period, a pronounced semidiurnal variation in the F region electron density and its local-time phase shift similar to the previous observations are reproduced by the model and COSMIC observation. The model suggests that the electron density variation is caused by an enhanced semidiurnal variation in the E Â B drift, which is probably related to an amplified semidiurnal migrating tide (SW2) in the lower thermosphere. The model and TIMED/SABER observation show that the SW2 tide amplifies at low latitudes from the stratosphere to the thermosphere as well as the phase variation. Possible mechanisms for the SW2 variability in the low latitude stratosphere could be the change of its propagation condition, especially the (2, 2) mode, due to changing zonal background wind and meridional temperature gradient, and/or an enhancement of its source due to redistribution of stratospheric ozone. Present results also show a prominent long-term variation of the terdiurnal migrating component (TW3) in the ionosphere and atmosphere.

Sq and EEJ—A Review on the Daily Variation of the Geomagnetic Field Caused by Ionospheric Dynamo Currents

“…Figure 48 schematically illustrates the vertical coupling of the atmosphere during stratospheric sudden warmings. Understanding of those physical processes has been facilitated by numerical models of the "whole atmosphere" covering the height range from the surface to the exobase (e.g., Fuller-Rowell et al 2010;Jin et al 2012;Pedatella et al 2014b). …”

Similarity and differences in morphology and mechanisms of the <i>fo</i>F2 and TEC disturbances during the geomagnetic storms on 26–30 September 2011

“…Several important issues regarding the relationship between foF2 and TEC disturbances are still unresolved: (1) what is the global relationship between foF2 and TEC response to geomagnetic storms, and (2) how does this relationship vary with time, storm phase, longitude and latitude? It is important to note that only a limited number of first-principle models allow for this problem to be investigated, because the majority of the developed models have an upper boundary much lower than the GPS satellite orbits (Roble and Ridley, 1994;Jin et al, 2012).…”

DC Langmuir Probe for Measurement of Space Plasma: A Brief Review

“…The effect of sudden stratosphere warming (SSW) on the ionosphere has recently been studied, mainly using Total Electron Content (TEC) data (Jin et al 2012;Oyama et al 2014). Although SSW is a high latitude phenomenon that occurs around 10 hPa height, the ionosphere disturbance extends globally in longitude and latitude, maybe due to changes in the wind system of the thermosphere as well as the dynamo region atmosphere, which then changes the distribution of the electric field.…”