Spatial features of Weddell Sea and Yakutsk Anomalies in foF2 diurnal variations during high solar activity periods: Interkosmos-19 satellite and ground-based ionosonde observations, IRI reproduction and GSM TIP model simulation

Клименко, М. В.; Клименко, В. В.; Karpachev, A. T.; Ratovsky, Konstantin; Степанов, А. А.

doi:10.1016/j.asr.2014.12.032

Cited by 37 publications

(26 citation statements)

References 26 publications

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“…The dashed black lines in Figure are for 66° magnetic latitude ( L = 6) at 300 km in each hemisphere. The BSA clearly stands out in the Northern Hemisphere between about 100°E and 200°E longitude and between 55° and 70° latitude, which is approximately the same region that was obtained from the topside sounder data of Klimenko et al () taken during 1979–1981, a strong solar maximum period. In fact, the density ratio in Figure is ~0.8 or higher over a broad range of longitudes in the northern hemisphere below L = 6, only excluding the North American sector.…”

Section: Model and Datasupporting

confidence: 81%

“…The previously used names either refer to features other than the midnight to midday ratio or to phenomena located too far away from the main geographical location of the anomalous behavior. The data in the top panel of Figure 6 from Klimenko et al () show a single‐anomaly region that extends into the Bering Sea similar to the way that the WSA extends into the Weddell Sea.…”

Section: Introductionmentioning

confidence: 76%

“…On the other hand, their neutral winds agree well (within 5 m/s on average) with those obtained by Richards et al () and also with those from the newer HWM14 neutral wind model (Drob et al, ). Klimenko et al () obtained qualitative agreement between their first‐principles model and topside sounder and ionosonde electron density in the BSA and WSA anomalies. However, the strengths of both modeled anomalies were weaker than observed and the peak of the BSA was located near 90°E, which is well to the east of the observed peak near 150°E.…”

Section: Introductionmentioning

confidence: 83%

“…The Bering Sea anomaly (BSA) is similar to the Weddell Sea anomaly (WSA), which was initially identified in ionosonde data in the 1950s by Bellchambers and Piggott (). The BSA has been previously called the Yakutsk anomaly by Klimenko et al () and the Northern anomaly by Lomidze et al (). We use BSA because it is analogous to the southern hemisphere WSA and it better describes the main location of the anomalous midnight behavior that is the subject of this investigation.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Causes of the Longitudinal and Solar Cycle Variation of the Electron Density in the Bering Sea and Weddell Sea Anomalies

et al. 2018

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This paper investigates and quantifies the longitudinal, solar cyclical, and diurnal variation of the ionosphere peak electron density observed by six ionosondes located between 18 and 151°E near 60°N. Embedded within this region is the Bering Sea anomaly (BSA) where the midnight peak electron density exceeds the midday peak electron density in summer. The BSA is a region West of Alaska extending from approximately 100° to 200° east geographic longitude and 55° to 70° north geographic latitude at its widest. By comparing a physical model with ionosonde data from the 1970s and 1980s, it is found that longitudinal changes in the neutral winds and neutral densities are the most likely explanation for the electron density variation between 18 and 151°E near 60°N. Longitudinal differences in magnetic declination and inclination are small and have a negligible effect on the electron density behavior. Our definition of and the behavior of the BSA are analogous to the Weddell Sea anomaly (WSA), a region in the Southern Hemisphere where the midnight peak electron density also exceeds the midday peak electron density in summer. Although the overall BSA electron density is a factor of 2 smaller than that in the WSA, the two anomalies have similar midnight to midday electron density ratios. It is found that the BSA gets stronger with increasing solar activity, while the WSA gets weaker. It is also demonstrated that including vibrationally excited N2 in an ionosphere model is crucial for producing the observed midnight to midday electron density ratios.

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Section: Model and Datasupporting

confidence: 81%

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Causes of the Longitudinal and Solar Cycle Variation of the Electron Density in the Bering Sea and Weddell Sea Anomalies

et al. 2018

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“…High rays are calculated for the ionospheric medium predicted by International Reference Ionosphere (IRI) model (Bilitza (2001); Bilitza and Reinisch (2008); Bilitza et al (2014)), where the electron density is either unperturbed or perturbed by travelling ionospheric disturbances (TIDs). The IRI model describes the climatology of ionospheric parameters (Eccles et al, 2011;Klimenko et al, 2015) and is widely used to calculate a medium for radio wave propagation. In this paper, the daytime summer solstice ionosphere obtained with IRI-2007 is used.…”

Section: Introductionmentioning

confidence: 99%

Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere

Nosikov

Клименко

Bessarab

et al. 2017

Advances in Space Research

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Longitudinal variation in the ionosphere‐plasmasphere system at the minimum of solar and geomagnetic activity: Investigation of temporal and latitudinal dependences

Клименко

Zakharenkova

et al. 2016

Radio Science

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We use the Global Self-consistent Model of the Thermosphere, Ionosphere and Protonosphere (GSM TIP) as the first-principle calculation of the physical system state, the quick-run ionospheric electron density model (NeQuick) as the climatology background, and the International Reference Ionosphere-based Real-Time Assimilative Model for a global view of the ionospheric weather during a quiet period of the December 2009 solstice. The model computations are compared to the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) radio occultation profiles, CHAMP and Gravity Recovery and Climate Experiment in situ densities, and GPS total electron content (TEC). It is shown that the plasma density in the ionosphere is generally larger in the American/Atlantic longitudinal sector at any local time. The high-latitude density enhancements are visible in the GSM TIP output at different altitudes but are not reproduced by the NeQuick empirical model. Given that observational data confirm an existence of the high-latitude areas where ionospheric densities are elevated in the altitude range between 300 and 480 km, we conclude that the N m F 2 maximum in the GSM TIP output can be trusted. Indeed, such high-latitude N m F 2 , ionospheric electron content, and TEC maxima in the American longitude sector form on the proper places as shown by the GSM TIP data, COSMIC and GPS observations. According to our results, the high-latitude maximum of N m F 2 (1) manifests itself only when the integration over LT or UT of the global maps for 22 December 2009 includes nighttime, i.e., supporting an argument of its close association with the Weddell Sea Anomaly, and (2) also appears in the N e distribution at altitudes above the F 2 peak.

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Spatial features of Weddell Sea and Yakutsk Anomalies in foF2 diurnal variations during high solar activity periods: Interkosmos-19 satellite and ground-based ionosonde observations, IRI reproduction and GSM TIP model simulation

Cited by 37 publications

References 26 publications

Investigation of the Causes of the Longitudinal and Solar Cycle Variation of the Electron Density in the Bering Sea and Weddell Sea Anomalies

Investigation of the Causes of the Longitudinal and Solar Cycle Variation of the Electron Density in the Bering Sea and Weddell Sea Anomalies

Application of the nudged elastic band method to the point-to-point radio wave ray tracing in IRI modeled ionosphere

Longitudinal variation in the ionosphere‐plasmasphere system at the minimum of solar and geomagnetic activity: Investigation of temporal and latitudinal dependences

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