Generation of secondary waves due to intensive large-scale AGW traveling

Astafyeva, Elvira; Afraimovich, É. L.; Voeykov, S. V.

doi:10.1016/j.asr.2007.03.059

Cited by 16 publications

(11 citation statements)

References 7 publications

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“…The third peak's amplitude was comparable or even exceeded that of the EIA crests, especially at the orbital altitude of the CHAMP satellite. The plasma gradients at the poleward boundary of the observed perturbation reached ~1.3 TECU/d, e.g., of latitude (Figure ), which is comparable with superstorm values [e.g., Astafyeva et al , ] and can have a significant space weather impact. The CTIPe model simulations partly reproduced the occurrence of the three‐peak N e structure in the American and Pacific longitudinal sectors from 17:30 UT to 19:00 UT.…”

Section: Discussionsupporting

confidence: 71%

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere

2016

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In this work, we discuss the occurrence of the dayside three‐peak electron density structure in the ionosphere. We first use a set of ground‐based and satellite‐borne instruments to demonstrate the development of a large‐amplitude electron density perturbation at the recovery phase of a moderate storm of 11 October 2008. The perturbation developed in the F2 and low topside ionospheric regions over the American sector; it was concentrated on the north from the equatorial ionization anomaly (EIA) but was clearly separated from it. At the F2 region height, the amplitude of the observed perturbation was comparable or even exceeded that of the EIA. Further analysis of the observational data together with the Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics model simulation results showed that a particular local combination of the thermospheric wind surges provided favorable conditions for the generation of the three‐peak EIA structure. We further proceed with a statistical study of occurrence of the three‐peak density structure in the ionosphere in general. Based on the analysis of 7 years of the in situ data from CHAMP satellite, we found that such three‐peak density structure occurs sufficiently often during geomagnetically quiet time. The third ionization peak develops in the afternoon hours in the summer hemisphere at solstice periods. Based on analysis of several quiet time events, we conclude that during geomagnetically quiet time, the prevailing summer‐to‐winter thermospheric circulation acts in similar manner as the storm‐time enhanced thermospheric winds, playing the decisive role in generation of the third ionization peak in the daytime ionosphere.

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Section: Discussionsupporting

confidence: 71%

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere

2016

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“…This may mean that the auroral oval was more expanded toward midlatitudes than it is shown on the image Figure c. Otherwise, and more likely, such disagreement can be explained by other source of TEC slips than the boundary of the auroral oval, such as dayside storm‐induced “plume” of enhanced electron density as was shown previously for some storm events [e.g., Foster and Rideout , ], or large‐scale traveling ionospheric disturbances (TID) [e.g., Astafyeva et al , ; Nishioka et al , ].…”

Section: Discussionmentioning

confidence: 76%

Geomagnetic storms, super‐storms, and their impacts on GPS‐based navigation systems

et al. 2014

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Using data of GPS receivers located worldwide, we analyze the quality of GPS performance during four geomagnetic storms of different intensity: two super-storms and two intense storms. We show that during super-storms the density of GPS Losses-of-Lock (LoL) increases up to 0.25% at L1 frequency and up to 3% at L2 frequency, and up to 0.15% (at L1) and 1% (at L2) during less intense storms. Also, depending on the intensity of the storm time ionospheric disturbances, the total number of total electron content (TEC) slips can exceed from 4 to 40 times the quiet time level. Both GPS LoL and TEC slips occur during abrupt changes of SYM-H index of geomagnetic activity, i.e., during the main phase of geomagnetic storms and during development of ionospheric storms. The main contribution in the total number of GPS LoL was found to be done by GPS sites located at low and high latitudes, whereas the area of numerous TEC slips seemed to mostly correspond to the boundary of the auroral oval, i.e., region with intensive ionospheric irregularities. Our global maps of TEC slips show where the regions with intense irregularities of electron density occur during geomagnetic storms and will let us in future predict appearance of GPS errors for geomagnetically disturbed conditions.

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“…There have already been a few articles concerned with the study of ionospheric effects of these superstorms from the TEC data (Foster and Rideout, 2005;Crowley et al, 2006;Astafyeva et al, 2007;Afraimovich et al, 2008;Jakowski et al, 2008).…”

Section: Ionospheric Effects During the Storms In October And Novembementioning

confidence: 97%

study of ionospheric response to magnetic superstorms in the East Asian sector

Pirog

Полех

Романова

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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Generation of secondary waves due to intensive large-scale AGW traveling

Cited by 16 publications

References 7 publications

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere

Geomagnetic storms, super‐storms, and their impacts on GPS‐based navigation systems

study of ionospheric response to magnetic superstorms in the East Asian sector

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Generation of secondary waves due to intensive large-scale AGW traveling

Cited by 16 publications

References 7 publications

Occurrence of the dayside three‐peak density structure in the F2 and the topside ionosphere

Occurrence of the dayside three‐peak density structure in the F2 and the topside ionosphere

Geomagnetic storms, super‐storms, and their impacts on GPS‐based navigation systems

study of ionospheric response to magnetic superstorms in the East Asian sector

Contact Info

Product

Resources

About

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere

Occurrence of the dayside three‐peak density structure in the F₂ and the topside ionosphere