Investigation of energetic particle environments in the plasmasphere

该研究项目旨在研究与太阳活动相关的高层大气中高能粒子环境和大气条件的变化。1)在澳大利亚Birdsville （L=1.55）附近的发射机共轭区测量了L F哨声模信号。低频声发射增强信号的强度随时间延迟而增加，这是由于回旋共振与捕获电子相互作用引起的波增长超过30克v，低频声发射增强信号的频率发生偏移，这是由于磁层电场穿透低纬磁层引起的哨声管漂移造成的。否则，在等离子体纬度磁层中产生的低频/极低频辐射和在低纬度地面站观测到的低频/极低频辐射几乎与AB活动增强同时发生。因此，高能电子深入磁层的穿透可以从地面推断出来…更多低纬度共振波的测量。2)研究了南极Syowa站对流层顶高度、温度、气压和臭氧总量与太阳耀斑活动的关系。上述数量的时间变化被发现与高能质子和增强的X射线强度相关，这些强度与更大的太阳耀斑有关。3) Pi2的地磁脉动（周期：40 ~ 150秒）通常发生在夜间，伴有磁暴。利用基于210 MM地磁观测的Pi2地磁资料，研究了地震活动与地磁脉动活动的关系。1993年8月8日关岛发生大地震（Ms=7.1）时，由于震源区域周围的电导率增加，诱发Z分量增强。此外，偶尔主要在关岛的Z磁场上出现阶梯状的变化，这可能是由与前体活动有关的电场引起的。少

This research project aims to investigate variations of energetic particle environments and atmospheric conditions in the upper atmosphere, associated with solar activities.1) L F whistler-mode signals were measured in the conjugate area of the transmitter around Birdsville (L=1.55), Australia. The intensity increase of the LF signals appeared with the time delays behind enhanced AE activities, due to the wave growth caused by cyclotron resonance interactions with trapped electrons more than 30 ke V.The frequency of enhanced LF whistler-mode signals shifted, which is caused by the drift of whistler ducts due to the magnetospheric electric fields penetrating into the low-latitude magnetosphere. Otherwise, VLF/ELF emissions generated in the plasmapause-latitude magnetosphere and observed at low- latitude ground- based stations occurred almost simultaneously with enhanced AB activities. So, the penetration of energetic electrons deep into the magnetosphere may be deduced from ground-based … More measurements of resonant waves at low latitudes.2) The altitude, temperature, and pressure of the tropopause and the total ozone content over Syowa Station, Antarctica were investigated in association with the solar flare activities. The temporal variations of the above quantities were found to be correlated with the energetic protons and enhanced X ray intensities associated with the bigger solar flares.3) Geomagnetic pulsations of Pi2 (period : 40-150 sec) usually occur during nighttime in association with magnetic storms. By using the Pi2 geomagnetic data based on the 210 MM magnetic observations, the relation between seismic activities and geromagnetic pulsation activities was investigates. The geomagnetic fields during a large earthquake (Ms=7.1) at Guam on 8 August 1993 were enhanced in the induced Z components, due to the electrical conductivity increase around the earthquake source region.Also, step-like changes appear occasionally mainly on the Z fields at Guam, which may be caused by electric fields, related to the precursor activity. Less