Morphology of ionospheric F 2 region variability associated with sudden stratospheric warmings

Autor: Sumedha Gupta, Arun Kumar Upadhayaya
Rok vydání: 2017
Předmět:
Zdroj: Journal of Geophysical Research: Space Physics. 122:7798-7826
ISSN: 2169-9402
2169-9380
DOI: 10.1002/2017ja024059
Popis: The effect of Sudden Stratospheric Warming (SSW) on the F2 region ionosphere has been extensively analyzed for the major event of year 2009, apart from a few reports on other major and minor events. Morphology of ionospheric responses during SSW can be better comprehended by analyzing such warming events under different solar, geomagnetic and meteorological conditions. We investigate the features of F2 region variability following the SSW events of 2010, 2011, 2012, 2013, 2014, 2015 and 2016, using ionosonde data from the Asian region covering a broad latitudinal range from 26.6°N to 45.1°N. We find perceptible ionospheric variations in electron densities during these warming events which is accompanied by a large variation of ~117% within enhancements, as compared to a meagre variation of ~11% within depressions, during these events. We also examine six months’ data at these latitudes and longitudes and find that the maximum and minimum variation in F2 layer critical frequency is observed during each SSW period. The influence of quasi-stationary-16-day planetary waves is seen during these SSW events. Further, a recently proposed parameter “SSW integrated strength” by Vieira et al. [2017] to characterize SSW event with respect to ionosphere is also examined. It is seen that it does not fit well for these seven SSW events at these latitudes and longitudes.
Databáze: OpenAIRE
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