Solar cycle variation of the monthly median foF2 at Chongqing station, China

Xu, Tong; Wu, Zhensen; Wu, Jian; Wu, Jun

doi:10.1016/j.asr.2008.01.012

Cited by 18 publications

(10 citation statements)

References 22 publications

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“…The solar activity dependence of ionospheric F2 parameters has been studied for a long period. The critical frequency of the F2 layer (foF2) or peak density (N m F2) [23,[35][36][37][38][39][40][41][42][43][44], peak height (h m F2) [6,23,40], TEC [29][30][31][45][46][47][48][49][50][51], plasma temperature and scale height [40,51], and thermosphere winds [52][53][54][55], temperature and neutral compositions [55][56][57] have been recently invest-igated. These studies mainly discussed the complicated trends and sensitivity of the solar activity dependency of the ionosphere, the detailed features and physical processes, and how to represent those characteristics effectively in applications.…”

Section: Features Around the F2 Peakmentioning

confidence: 99%

Solar activity effects of the ionosphere: A brief review

et al. 2011

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Solar radiation, which varies over multiple temporal scales, modulates remarkably the evolution of the ionosphere. The solar activity dependence of the ionosphere is a key and fundamental issue in ionospheric physics, providing information essential to understanding the variations in the ionosphere and its processes. Selected recent studies on solar activity effects of the ionosphere are briefly reviewed in this report. This report focuses on (1) observations of solar irradiance at X-ray and extreme ultraviolet wavelengths and the outstanding problems of solar proxies, in the view of ionospheric studies, (2) new findings and improved representations of the features of the solar activity dependence of ionospheric key parameters and the corresponding physical processes, (3) possible phenomena in the ionosphere under extremely high and low solar activity conditions that are unique, as indicated by historical solar datasets and the deep solar minimum of solar cycle 23/24, and (4) statistical studies and model simulations of the ionosphere response to solar flares. The above-mentioned studies provide new clues for comprehensively explaining basic processes in the ionosphere and improving the prediction capability of ionospheric models and related applications.

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Section: Features Around the F2 Peakmentioning

confidence: 99%

Solar activity effects of the ionosphere: A brief review

et al. 2011

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“…However, with error statistical analysis, we argue that these models can mainly describe the variation of spread F occurrence over the three stations in China and work much more effectively than IRI2007. In further work, we will estimate the model with different solar proxies such as F107A [31], R [33], P [31], etc. and choose the most suitable solar proxy to construct models for other stations in China and eventually form an empirical regional model of monthly mean spread F occurrence over China.…”

Section: Discussionmentioning

confidence: 99%

“…As we all know, the relationship is very complicated. To simplify it, we use a quadratic regression to describe the solar activity dependence of spread F occurrence, which is widely used to describe the dependence of ionospheric features on solar activity [32,33]. The regression model is …”

Section: Empirical Model Of Spread F Occurrencementioning

confidence: 99%

Statistical analysis and model of spread F occurrence in China

et al. 2010

Sci. China Technol. Sci.

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The spread F data obtained over Lanzhou (36.1°N, 103.9°E), Chongqing (29.5°N, 106.4°E) and Haikou (20.0°N, 110.3°E) of China during the period from 1978 to 1997 are used to analyze the occurrence characteristics. The statistical results show that the post midnight spread F occurrence is maximum during the summer solstice months of the lower solar activity period, while post sunset spread F is dominant in equinoxes of higher solar activity period over Haikou station. Over Chongqing and Lanzhou stations, spread F mostly occurs at post midnight and relates negatively with solar activity. Using regression method and Fourier expansion, the preliminary single-station model of spread F occurrence is established and the accuracy of the model is evaluated. spread F, solar cycle variation, seasonal variation, empirical model Citation:Xu T, Wu Z S, Hu Y L, et al. Statistical analysis and model of spread

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“…This advantage of effective indices of solar activity can be explained by the fact that variations in the foF2 median with the solar activity cycle depend on not only the level of this activity, but also some other factors, including geomagnetic activity, which are not consid ered when using R 12 . The dependence of the foF2 median on geomagnetic activity was analyzed only in a few works and was based on the search for a depen dence of foF2 on Ap m (Sole, 1998) or Ap 12 (Xu et al, 2008), where Ap m is the monthly average geomagnetic activity index Ap and Ap 12 is the 12 month average value of this index. In addition, the dependence of the foF2 median on Ap m was considered during the analy sis of long term variations in this median (Bremer, 1998;Laštovi ka et al, 2006;Bremer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

What solar and geomagnetic activities does F2-layer critical frequency median correspond to in midlatitudes?

Dëminov

Deminova

2015

Geomagn. Aeron.

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A correlation was found between indices of solar and geomagnetic activities for monthly foF2 median and average values of these indices on the basis of an analysis of data on the F2 layer critical frequency foF2 from Slough and Chilton stations for 1954-2013. It was found that there is no systematic difference between the index of solar activity for a median foF and the 81 day or yearly average index of this activity. Cases in which a foF2 median corresponds to high geomagnetic activity are about 3-4 times rarer than observed cases of this high activity. Therefore, the geomagnetic activity that corresponds to a foF2 median is lower than the monthly average index of this activity on average, and this difference increases as the geomag netic activity grows. The behaviors of relations between solar and geomagnetic activity indices for a foF2 median and the average values of these indices almost coincide for periods of relatively high (1954-1995) and low (1996-2003) solar and geomagnetic activity.

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Solar cycle variation of the monthly median foF2 at Chongqing station, China

Cited by 18 publications

References 22 publications

Solar activity effects of the ionosphere: A brief review

Solar activity effects of the ionosphere: A brief review

Statistical analysis and model of spread F occurrence in China

What solar and geomagnetic activities does F2-layer critical frequency median correspond to in midlatitudes?

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