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首页> 外文学位 >Ionospheric studies based on geostationary satellite observations from Guwahati.
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Ionospheric studies based on geostationary satellite observations from Guwahati.

机译：基于来自Guwahati的对地静止卫星观测的电离层研究。

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摘要

Ionospheric electron content (IEC) studies have been made from a low-midlatitude station, Guwahati, using radio beacon of the geostationary satellite ETS-II for a high solar activity period from June 1980 through December 1981. The study is first of its kind from the location.;Studies on the integrated production rate (Qo) of IEC reveal strong seasonal anomaly in this parameter, - minimum values are observed in summer and highest in winter. The initial zenith angle of sun for ionization production is found to be highest in winter and lowest in summer indicating the predominance of atomic oxygen as the main absorber of solar radiation in all seasons except summer, for the observation period. The effective loss rate beta' is found to have two distinct values - initial one (beta'1) for the evening hours, and final another (beta'2) for midnight hours. The initial loss rate beta'1 is found to have peaks both in summer and winter, while final loss rate beta'2 have peak values for the equinoctial periods.;Diurnal behaviour of IEC for the period has been critically examined. IEC is found to start growing from a pre-dawn minimum and shows a steep growth with sunrise. It shows multiple growth rates - the highest being from 10-11 hr LT. At about 14 hr LT, IEC reaches the diurnal maximum value. Low depth bite-out effects in noontime IEC are observed on some occasions, and its occurrence is found to be maximum in summer. Sometimes, signatures of medium scale TIDs are also seen on the daytime IEC profiles. Occurrence of such TIDs are found to be maximum in winter, and interestingly they have maximum occurrence on days having geomagnetic index Ap in a range from 6 to 10. Small evening IEC enhancements of maximum occurrence in the equinoctial months, have also been observed at around 20 hr LT. Anomalous night enhancements, quite small in magnitude, are noticed around midnight, and they are seen more often in summer. The diurnal range of IEC shows annual variation - maximum of 16 in autumn and minimum of 5 in summer. IEC peak values show semiannual variation with strong seasonal anomaly - winter values being considerably higher than that of summer. The anomaly is found to be absent in midnight IEC, while diurnal minimum value of IEC shows annual variation - having its highest values during summer months and smallest in autumn.
机译：电离层电子含量（IEC）研究是在1980年6月至1981年12月的高太阳活动期间使用对地静止卫星ETS-II的无线电信标在古瓦哈提低中纬度电台进行的。有关IEC的综合生产率（Qo）的研究表明，该参数存在强烈的季节性异常--在夏季观察到最小值，在冬季观察到最大值。发现用于电离生产的太阳的初始天顶角在冬季最高，而在夏季最低。这表明在整个观察期中，除夏季以外的所有季节中，原子氧都是太阳辐射的主要吸收体。发现有效损失率beta'具有两个不同的值-晚上的一个初始值（beta'1），午夜的一个最终值（beta'2）。发现初始损耗率β'1在夏季和冬季均具有峰值，而最终损耗率β'2在等值周期具有峰值。;已对该周期内IEC的昼夜行为进行了严格检查。发现IEC从黎明前的最小值开始增长，并随着日出而急剧增长。它显示出多种增长率-最高的是LT 10-11 hr。大约在LT的14小时，IEC达到了日最大值。在某些情况下，中午IEC观察到低深度的咬合效应，在夏天，这种现象的发生率最高。有时，在白天的IEC配置文件中也会看到中等规模TID的签名。发现这种TID的发生在冬季最多，有趣的是，在地磁指数Ap为6至10的日子中，此类TID的发生最大。 LT 20小时。午夜前后发现夜间异常增强幅度很小，在夏季更常见。 IEC的日变化范围显示年度变化-秋季最大为16，夏季最小为5。 IEC峰值显示半年度变化，且具有强烈的季节性异常-冬季值明显高于夏季。发现IEC午夜不存在异常，而IEC的昼夜最小值显示年度变化-在夏季月份具有最大值，而在秋季则最小。

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  • 作者

    Rahman, Khalilur.;

  • 作者单位

    Gauhati University (India).;

  • 授予单位 Gauhati University (India).;
  • 学科 Physics.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 200 p.
  • 总页数 200
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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