scholarly journals Quiet time variability of the GPS TEC and EEJ strength over Indian region associated with major sudden stratospheric warming events during 2005/2006

2012 ◽  
Vol 117 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
S. Sripathi ◽  
A. Bhattacharyya
Keyword(s):  
Indian Region ◽  
Time Variability ◽  
Stratospheric Warming ◽  
Quiet Time ◽  
Sudden Stratospheric Warming ◽  
Gps Tec

Investigation of vertical wavenumber spectra during sudden stratospheric warming (SSW) events over the Indian region

2019 ◽  
Vol 10 (7) ◽  
pp. 699-708 ◽  
Author(s):  
Priyanka Ghosh ◽  
Som Sharma ◽  
Kamran Ansari
Keyword(s):  
Indian Region ◽  
Stratospheric Warming ◽  
Sudden Stratospheric Warming

scholarly journals Quiet time ionospheric variability over Arecibo during sudden stratospheric warming events

2010 ◽  
Vol 115 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. L. Chau ◽  
N. A. Aponte ◽  
E. Cabassa ◽  
M. P. Sulzer ◽  
L. P. Goncharenko ◽  
...  
Keyword(s):  
Stratospheric Warming ◽  
Quiet Time ◽  
Sudden Stratospheric Warming ◽  
Ionospheric Variability

scholarly journals Identification of the mechanisms responsible for anomalies in the tropical lower thermosphere/ionosphere caused by the January 2009 sudden stratospheric warming

2019 ◽  
Vol 9 ◽  
pp. A39 ◽  
Author(s):  
Maxim V. Klimenko ◽  
Vladimir V. Klimenko ◽  
Fedor S. Bessarab ◽  
Timofei V. Sukhodolov ◽  
Pavel A. Vasilev ◽  
...  
Keyword(s):  
Electric Field ◽  
Phase Change ◽  
Lower Thermosphere ◽  
Upper Atmosphere ◽  
Electron Content ◽  
Stratospheric Warming ◽  
Sudden Stratospheric Warming ◽  
Low Latitude ◽  
Plasma Drift ◽  
Solar Tide

We apply the Entire Atmosphere GLobal (EAGLE) model to investigate the upper atmosphere response to the January 2009 sudden stratospheric warming (SSW) event. The model successfully reproduces neutral temperature and total electron content (TEC) observations. Using both model and observational data, we identify a cooling in the tropical lower thermosphere caused by the SSW. This cooling affects the zonal electric field close to the equator, leading to an enhanced vertical plasma drift. We demonstrate that along with a SSW-related wind disturbance, which is the main source to form a dynamo electric field in the ionosphere, perturbations of the ionospheric conductivity also make a significant contribution to the formation of the electric field response to SSW. The post-sunset TEC enhancement and pre-sunrise electron content reduction are revealed as a response to the 2009 SSW. We show that at post-sunset hours the SSW affects low-latitude TEC via a disturbance of the meridional electric field. We also show that the phase change of the semidiurnal migrating solar tide (SW2) in the neutral wind caused by the 2009 SSW at the altitude of the dynamo electric field generation has a crucial importance for the SW2 phase change in the zonal electric field. Such changes lead to the appearance of anomalous diurnal variability of the equatorial electromagnetic plasma drift and subsequent low-latitudinal TEC disturbances in agreement with available observations. Plain Language Summary – Entire Atmosphere GLobal model (EAGLE) interactively calculates the troposphere, stratosphere, mesosphere, thermosphere, and plasmasphere–ionosphere system states and their response to various natural and anthropogenic forcing. In this paper, we study the upper atmosphere response to the major sudden stratospheric warming that occurred in January 2009. Our results agree well with the observed evolution of the neutral temperature in the upper atmosphere and with low-latitude ionospheric disturbances over America. For the first time, we identify an SSW-related cooling in the tropical lower thermosphere that, in turn, could provide additional information for understanding the mechanisms for the generation of electric field disturbances observed at low latitudes. We show that the SSW-related vertical electromagnetic drift due to electric field disturbances is a key mechanism for interpretation of an observed anomalous diurnal development of the equatorial ionization anomaly during the 2009 SSW event. We demonstrate that the link between thermospheric winds and the ionospheric dynamo electric field during the SSW is attained through the modulation of the semidiurnal migrating solar tide.

The Southern Hemisphere Sudden Stratospheric Warming in September 2019 and its predictions in S2S Models

2020 ◽  
Author(s):  
Jian Rao ◽  
Chaim I Garfinkel ◽  
Ian White ◽  
Chen Schwartz
Keyword(s):  
Southern Hemisphere ◽  
Stratospheric Warming ◽  
Sudden Stratospheric Warming
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