Investigation of energetic particle environments in the plasmasphere

1)在澳大利亚伯兹维尔(L=1.55)发射机的共轭区测量了L F哨声模信号。由于与俘获电子的回旋共振相互作用引起的波增长超过30keV，低频信号的强度随增强声发射活动的时间延迟而增加。增强的低频哨声模信号的频率发生漂移，这是由于磁层电场穿透低纬磁层导致哨声管漂移造成的。此外，在等离子体顶-纬度磁层产生的、在低纬地面站观测到的甚低频/极低频辐射几乎与增强的AB活动同时发生。因此，高能电子在磁层深处的穿透可以从地基…中推断出来。2)研究了南极Syowa站上空对流层顶的高度、温度、气压和臭氧总量与太阳耀斑活动的关系。3)Pi2的地磁脉动(周期：40-150秒)通常发生在与磁暴有关的夜间。利用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日关岛大地震(M_s=7.1)时，由于震源区附近电导率的增加，诱发Z分量的地磁场增强，而且关岛的Z场偶有阶梯状变化，这可能是与前兆活动有关的电场引起的。较少

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