Study of dynamic and elecimanagnetic conpling processes in the micilatifi vie. ionosphere

等离子体与中性大气之间的耦合过程对理解电离层非常重要。等离子体的不均匀性是极化电场的来源，极化电场沿地磁力线分布很长。在我们的四个研究课题中，我们得到了以下结果：主题1：大气电离层耦合过程新研究的集思广益2006年举行了一次国际研讨会，对该主题进行了深入讨论。通过讨论，制定了未来火箭试验计划。目前已向JAXA/ISAS提出。本文利用MU雷达（f区FAI观测）、山形坂田便携式雷达（e区FAI观测）和气辉成像仪（中性大气密度波动观测）进行FERIX-2观测活动，并直接比较了两个地区的FAI。我们发现f区FAI具有较小尺度的结构，沿着较大结构的波前向西北传播。e区fai往往出现在同一场线上f区fai缺失的地方。课题3：小尺度FAI结构的雷达成像实验利用MU雷达开展FAI的雷达成像观测。我们发现了GPS-TEC中e区fai与MSTID之间的F区和e区耦合关系。对中纬度f区fai的首次观测也取得了成功。雷达成像在FERIX-2观测活动中充分利用了这一主题。课题四：卫星/火箭与地面电离层信标实验2007年夏季加入ISAS探空火箭观测，开展了火箭-地面信标实验。我们研制了一种新型的数字信标接收机，并将其用于实验。

Coupling processes between plasma and neutral atmosphere is very important to understand the ionosphere. Inhomogeneity of plasma is the source of polarization electric field that maps very long along the geomagnetic field line. We obtained following results in our four research topics.Topic 1: Brainstorming for new studies of atmosphere ionosphere coupling processesInternational workshop was held in 2006 for intensive discussion on the topic. Future rocket experiment plan was made through the discussion. and is now proposed to JAXA/ISAS.Topic 2: F-region E-region coupling observationsWe conducted FERIX-2 observation campaign with the MU radar (F-region FAI observation), a portable radar in Sakata, Yamagata (E-region FAI observation), and an airglow imager (observation of neutral atmosphere density fluctuation), and directly compared FAIs in both regions. We found that F-region FAI has smaller scale structure that propagate northwestward along the wavefront of the larger structures. E-region FAIs tend to appear where F-region FAIs on the same field line are missing.Topic 3: Experiment of small-scale FAI structures with radar imaging techniqueWe developed the radar imaging observations of FAIs with the MU radar. We found F- and E-region coupling relationship between the E-region FAIs and MSTID in GPS-TEC. First observations of midlatitude F-region FAIs were also successful. Radar imaging flout this topic was fully utilized in the FERIX-2 observation campaign.Topic 4: Ionosphere beacon experiment between satellite/rocket and groundWe joined the ISAS sounding rocket observations in summer 2007, and conducted rocket-ground beacon experiment. We developed a new digital beacon receiver, and use it for the experiment.