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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Modeling the equatorial and low-latitude ionospheric response to an intense X-class solar flare
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Modeling the equatorial and low-latitude ionospheric response to an intense X-class solar flare

机译:建模赤道和低纬度电离层响应强烈的x级太阳能耀斑

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We have investigated the ionospheric response close to the subsolar point in South America due to the strong solar flare (X2.8) that occurred on 13 May 2013. The present work discusses the sudden disturbances in the D region in the form of high-frequency radio wave blackout recorded in ionograms, the E region disturbances in the form of the Sq current and equatorial electrojet intensifications, and the enhancement and decay in the ionospheric total electron content (TEC) as observed by a network of Global Navigation Satellite Systems receivers, the last of these manifestations constituting the main focuses of this study. The dayside ionosphere showed an abrupt increase of the TEC, with the region of the TEC increase being displaced away from the subsolar point toward the equatorial ionization anomaly (EIA) crest region. The decay in the ΔTEC following the decrease of the flare EUV flux varied at a slower ratio near the EIA crest than at the subsolar point. We used the Sheffield University Plasmasphere-Ionosphere Model to simulate the TEC enhancement and the related variations as arising from the flare-enhanced solar EUV flux and soft X-rays. The simulations are compared with the observational data to validate our results, and it is found that a good part of the observed TEC variation features can be accounted for by the model simulation. The combined results from model and observational data can contribute significantly to advance our knowledge about ionospheric photochemistry and dynamics needed to improve our predictive capability on the low-latitude ionospheric response to solar flares.
机译:我们已经调查了电离层响应靠近赤道的点在南美洲强烈的太阳耀斑(X2.8)发生2013年5月13日。突然D地区扰动形式高频无线电波停电记录电离图,E区域干扰形式平方的当前和赤道电喷流强化,增强和腐烂在电离层总电子含量(TEC)所观察到的一个全球网络导航卫星系统接收器,最后的部分构成的主要集中表现本研究。TEC的突然增加,与该地区的TEC增加流离失所的远离现世的指向赤道电离异常(EIA)波峰区域。耀斑EUV通量的减少EIA波峰附近的变化以较慢的比率在赤道的点。大学Plasmasphere-Ionosphere模型模拟TEC增强和相关如因flare-enhanced变化太阳能EUV通量和软x射线。与观测数据相比验证我们的结果,发现一个好观察TEC变化特性的一部分占的仿真模型。结合模型和观测结果数据可以为推进我们做出重大贡献电离层光化学和知识动力需要改善我们的预测能力在低纬度电离层太阳耀斑。

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