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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Traveling planetary wave ionospheric disturbances and their role in the generation of equatorial spread-F and GPS phase fluctuations during the last extreme low solar activity and comparison with high solar activity
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Traveling planetary wave ionospheric disturbances and their role in the generation of equatorial spread-F and GPS phase fluctuations during the last extreme low solar activity and comparison with high solar activity

机译：在最近一次极低太阳活动期间行进的行星波电离层扰动及其在赤道展宽F和GPS相位波动的产生中的作用以及与高太阳活动的比较

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摘要

This investigation studies traveling planetary wave ionospheric disturbance (TPWID) type oscillations on the modulation of the F region virtual height rise during the Ex B electric field pre-reversal enhancement (PRE), near sunset hours. We also studied their role in the generation of equatorial spread F (ESF) and GPS phase fluctuations during periods of the last extreme low solar activity (LSA) of January 2009 to April 2010 ((F10.7) over bar = 73). A comparison is made with periods of high solar activity (HSA) in 2003 and 2004 near equatorial region. The ionospheric irregularities investigated are medium (bottom-side) and large (plasma bubble) scales. Ionospheric F region oscillations with period of days are due to the TPWIDs, which play an important role in producing favorable or unfavorable conditions for equatorial ionospheric irregularities, changing the electron vertical profile and F region height In this paper, we present simultaneous ionospheric sounding (ionosonde) and GPS vertical total electron content (vTEC) observations carried out near equatorial region (Palmas 10.2 degrees S, 48.2 degrees W) and low latitude region (Sao Jose dos Campos 23.2 degrees S, 45.9 degrees W; located under the southern crest of the equatorial ionospheric anomaly), Brazil. Observations show that the occurrence of fresh ESF during LSA and HSA and fresh GPS phase fluctuations at equatorial region follow the trend of day-to-day variations in the F region virtual height, which are due to electric field PRE modulated by TPWID wave like oscillations. During LSA, the altitude of 250 km acts as a threshold height for the generation of fresh ionospheric irregularities, whereas during HSA, the threshold height is 300 Ion The observations also found a strong increase in the generation of fresh ionospheric irregularities from October 2009 to March 2010 during LSA and fromSeptember 2003 to March 2004 during the HSA. Furthermore, in LSA, the period of fresh ionospheric irregularities was less than during HSA, though both periods followed a similar seasonal pattern. In the lowlatitude, we observed more ESFs than phase fluctuations because ionosonde is more sensitive than GPS. We also observed periods with and without day-to-day oscillations in the F region virtual height The observations made by GPS stations and ionosondes in the equatorial region, for much of the period analyzed, presented similar results with regard to the generation of equatorial ionospheric irregularities. In the low latitude, some nights of January, February, October, and December 2009 also showed a similarity. (C) 2014 Elsevier Ltd. All rights reserved.
机译：这项研究研究了在接近日落时间的Ex B电场预反转增强（PRE）期间，对F区虚拟高度升高的调制进行的行进行星波电离层扰动（TPWID）型振荡。我们还研究了它们在2009年1月至2010年4月的最后一次极低太阳活动（LSA）期间（（f10.7）超过bar = 73）在赤道扩展F（ESF）和GPS相位波动的产生中的作用。与2003年和2004年赤道地区附近的高太阳活动期（HSA）进行了比较。研究的电离层不规则度是中等（底部）和大（等离子气泡）规模。 TPWIDs导致电离层F区发生数天的振荡，这在产生有利或不利于赤道电离层不规则性，改变电子垂直剖面和F区高度的过程中起着重要作用。在本文中，我们同时提出了电离层探测（ionosonde ）和GPS垂直总电子含量（vTEC）的观测在赤道区（南极帕氏10.2度，西经48.2度）和低纬度地区（圣何塞·多斯坎普斯23.2度，西经45.9度;位于南半球南部）赤道电离层异常），巴西。观测表明，在LSA和HSA期间，新鲜的ESF的发生以及赤道区域的GPS相位的新波动遵循F区域虚拟高度的每日变化趋势，这是由于TPWID波像振荡一样调制的电场PRE 。在LSA期间，高度250 km是产生新的电离层不规则性的阈值高度，而在HSA期间，阈值高度为300离子。从2009年10月到3月，观测还发现，在新鲜电离层中不规则性的产生量大大增加。 LSA期间为2010年，HSA期间为2003年9月至2004年3月。此外，在LSA中，新的电离层不规则时期少于HSA，尽管两个时期遵循相似的季节性模式。在低纬度地区，由于离子探空仪比GPS更为灵敏，因此我们观测到的ESF比相位波动更多。我们还观察到F区虚拟高度存在和不存在日常振荡的时期。在所分析的大部分时期内，赤道地区GPS站和离子探空仪的观测结果在赤道电离层的产生方面都得出了相似的结果。违规行为。在低纬度地区，2009年1月，2月，10月和2009年12月的某些夜晚也表现出相似性。 （C）2014 Elsevier Ltd.保留所有权利。

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