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Study of generating mechanism of ionospheric E-region irregularities with rocket/radar simultaneous observations

火箭/雷达同步观测电离层E区不规则性产生机制研究

基本信息

批准号：
14340145
负责人：
FUKAO Shoichiro
金额：
$ 9.22万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Ionospheric irregularities in the mid-latitude E-region has been a study topics for more than ten years. The epoch was the discovery of the quasi-periodic (QP) structure in the E-region FAI (Field-Aligned Irregularity) echoes observed with the MU radar in Japan. The QP structures appear in the E-region FAI as a reflection of modulation pattern in the Sporadic-E (Es) layers. The structures are associated with polarization electric field, which suggests strong coupling process between the ionized and neutral atmosphere. In August 2002, we conducted SEEK-2 (Sporadic-E Experiment over Kyushu 2) campaign in Japan under collaboration with scientists from Japan, USA and Taiwan. The SEEK-2 consists of two sounding rockets of Institute of Space and Aeronautical Sciences that include in-situ experiment of electron density, electron temperature, electric field, plasma fluctuation and waves, and geomagnetic field as before. This research program is mainly dedicated to conduct the SEEK-2 ground-based observations. We operated two radars of 24.5 MHz and 31.6 MHz, ionosonde network of Japan, an MF radar, several airglow imagers, and a GPS scintillation-receiver system. We observed intense QP echoes with radars after 23 LT (= UT + 9 hours) on August 3, 2002, and launched rockets into the E-region at 2324 LT and 2339 LT. The operation of the SEEK-2 was very successful as we could, select a good event for the launches. All instruments on the rockets worked fine. We have found that the rockets detected multi-layered Es-layers at 103, 105 and 129 km altitudes, and intense electric fields that approach +-10 mV/m. In March 2003, we hosted the SEEK-2 workshop for data comparison and analysis. From this observation program we published more than 30 papers in the international journals. Numbers of oral presentations from the SEEK-2 results were 21 in international conferences, and 54 in domestic meetings.

中纬度E区电离层不规则性是近十年来的研究课题。这个时代是在日本MU雷达观测到的E区FAI（场向不规则性）回波中发现准周期（QP）结构。QP结构出现在E区FAI中，作为散在E（Es）层中的调制图案的反射。这些结构与极化电场有关，表明电离层与中性层之间存在强耦合过程。2002年8月，我们与来自日本、美国和台湾的科学家合作，在日本进行了SEEK-2（九州2号上空散发性E实验）活动。SEEK-2由中国航天航空科学研究院的两枚探空火箭组成，包括电子密度、电子温度、电场、等离子体波动和波动以及地磁场的原位实验。该研究计划主要致力于进行SEEK-2地面观测。我们操作了两个24.5 MHz和31.6 MHz的雷达，日本的电离层探测器网络，一个MF雷达，几个气辉成像仪，和一个GPS定位接收机系统。我们在2002年8月3日23 LT（= UT + 9小时）后用雷达观察到强烈的QP回波，并在2324 LT和2339 LT向E区发射了火箭。火箭上的所有仪器都工作正常。我们发现，火箭在103、105和129公里的高度探测到多层Es层，以及接近+-10 mV/m的强电场。2003年3月，我们主办了SEEK-2数据比较和分析讲习班。从这个观察项目中，我们在国际期刊上发表了30多篇论文。SEEK-2结果的口头报告在国际会议上有21次，在国内会议上有54次。