Signatures of Sudden Stratospheric Warming on the Equatorial Ionosphere-Thermosphere System

Sumod, S. G.; Pant, Tarun Kumar; Jose, Lijo; Hossain, Mosarraf; Kumar, Karanam Kishore

doi:10.1016/j.pss.2011.08.005

Cited by 27 publications

(28 citation statements)

References 29 publications

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“…It can be explained by the fact that in quiet day, TUCU is located behind the crest of the equatorial ionization anomaly, and during SSW, this station may be located at the peak of the EIA crest. The observations in the South American sector are quite different than those observed in the Indian sector [Sumod et al, 2012]. The present study carried out over the South American sector reveals strong foF2 disturbances compared with those of the quiet day variations, while these disturbances are weaker (~1 MHz) and not as long lasting in the Indian sector.…”

Section: Ionosonde-measured H′f and Fof2 Variations At Low Latitudecontrasting

confidence: 88%

“…These deviations are largest in the afternoon-evening hours, reaching 50-70 km for h′F and 5-6 MHz for foF2. These American-longitude disturbances are found to be stronger than those reported by Sumod et al [2012] in the Indian sector. 4.…”

contrasting

confidence: 54%

“…This increase is followed by a smaller decrease in h′F at 2-4 UT. Sumod et al [2012] reported an increasing h′F in the evening hours (18:30 LT) over the Indian sector during the SSW of the January 2008 period. In addition, they pointed out that the strengthening of the prereversal enhancement may be associated with the SSW.…”

Section: 1002/2014ja020649mentioning

confidence: 95%

“…As a result of this change in its interaction, the polar stratospheric temperature increases during several days. Recently, an unforeseen coupling between high latitudes, midlatitudes, and equatorial/low latitudes at upper atmospheric/ionospheric altitudes was discovered during sudden stratospheric warming (SSW) events [Goncharenko and Zhang, 2008;Goncharenko et al, 2010aGoncharenko et al, , 2010bGoncharenko et al, , 2013aGoncharenko et al, , 2013bVineeth et al, 2009;Chau et al, 2010Chau et al, , 2012Liu et al, 2011;Pancheva and Mukhtarov, 2011;Bessarab et al, 2012;Fang et al, 2012;Korenkov et al, 2012;Sripathi and Bhattacharyya, 2012;Sumod et al, 2012;Olson et al, 2013;Upadhayaya and Mahajan, 2013;Xiong et al, 2013;Pedatella et al, 2014aPedatella et al, , 2014b. Therefore, various aspects involved behind the effects of SSW need to be explored in order to improve our knowledge about the Earth's atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Ionospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector

et al. 2015

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The present study investigates the ionospheric total electron content (TEC) and F-layer response in the Southern Hemisphere equatorial, low, and middle latitudes due to major sudden stratospheric warming (SSW) event, which took place during January-February 2009 in the Northern Hemisphere. In this study, using 17 ground-based dual frequency GPS stations and two ionosonde stations spanning latitudes from 2.8°N to 53.8°S, longitudes from 36.7°W to 67.8°W over the South American sector, it is observed that the ionosphere was significantly disturbed by the SSW event from the equator to the midlatitudes. During day of year 26 and 27 at 14:00 UT, the TEC was two times larger than that observed during average quiet days. The vertical TEC at all 17 GPS and two ionosonde stations shows significant deviations lasting for several days after the SSW temperature peak. Using one GPS station located at Rio Grande (53.8°S, 67.8°W, midlatitude South America sector), it is reported for the first time that the midlatitude in the Southern Hemisphere was disturbed by the SSW event in the Northern Hemisphere.

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Section: Ionosonde-measured H′f and Fof2 Variations At Low Latitudecontrasting

confidence: 88%

contrasting

confidence: 54%

Section: 1002/2014ja020649mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Ionospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector

et al. 2015

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“…Several more recent studies have presented ground-based and satellite measurements consistent with the suggestion enhanced lunar semidiurnal tidal effects play fundamentally important roles on low-latitude electrodynamic perturbations during SSW events [Liu et al, 2011;Park et al, 2012;Sumod et al, 2012;Yamazaki et al, 2012a, b].…”

Section: Lunar Tidal Effects During Sudden Stratospheric Warmingsmentioning

confidence: 72%

Lunar tidal effects in the electrodynamics of the low latitude ionosphere

Fejer

Tracy

2013

Journal of Atmospheric and Solar-Terrestrial Physics

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respectively. The monthly and semimonthly amplitudes decrease from early morning to afternoon and evening to morning with moderate to large increases near dusk and dawn.We also examined these perturbation drifts during periods of sudden stratospheric warmings (SSWs). Our results show, for the first time, the enhancements of the lunar semimonthly tidal effects associated with SSWs to occur at night, as well as during the day. Our results also indicate during SSWs, monthly tidal effects are not enhanced as strongly as the semimonthly effects. We also examined these perturbation drifts during periods of sudden stratospheric warmings (SSWs), which is a meteorological event where the polar vortex is displaced or splits and which has been known to be associated with a large increase in planetary wave activity. Our results show, for the first time, the enhancements of the lunar semimonthly tidal effects associated with SSWs to occur at night, as well as during the day. Our results also indicate during SSWs monthly tidal effects are not enhanced as strongly as the semimonthly effects.vii ACKNOWLEDGMENTS

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On the ionospheric and thermospheric response of solar flare events of 19 January 2005: An investigation using radio and optical techniques

et al. 2014

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This study presents optical signatures of thermospheric OI 630.0 nm dayglow variability over a geomagnetic dip equatorial station Trivandrum (8.5°N, 77°E, 0.5°dip latitude), India, in response to solar flares of different ranks that occurred on 19 January 2005. It is found that over equator, the response of thermospheric dayglow to solar flares can be either prompt or delayed depending upon rank of the flare and dominant neutral/electrodynamical processes prevailing in the emission altitudes. This is strikingly in contrast to the earlier results, where prompt response of equatorial OI 630.0 nm dayglow to solar flares has been noticed. In addition, the flare-induced changes at the E and F regions of the equatorial ionosphere are studied using high-cadence measurements of the equatorial electrojet (EEJ) and total electron content (TEC) obtained from the ground-based magnetometers and GPS receivers, respectively. The Hall/Pedersen conductivity measurements as inferred using the magnetometers over the EEJ station and an off-EEJ station showed concomitant changes during these flares. Although, the GPS-measured TEC showed prompt enhancement associated with these flares, the evolution of the equatorial ionization anomaly, as seen in the TEC did not show any flare-induced changes. The plausible mechanisms explaining these observations are adduced in context of the present understanding of the equatorial electrodynamics and its imprint on these dayglow features.

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Signatures of Sudden Stratospheric Warming on the Equatorial Ionosphere-Thermosphere System

Cited by 27 publications

References 29 publications

Ionospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector

Ionospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector

Lunar tidal effects in the electrodynamics of the low latitude ionosphere

On the ionospheric and thermospheric response of solar flare events of 19 January 2005: An investigation using radio and optical techniques

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