[PEM11-P03] New perspectives on coupling processes in solar-terrestrial system obtained by comprehensive data analysis
Keywords:upper atmosphere, coupling between multiple regions, comprehensive analysis, long-term observational data
We present some examples of scientific results achieved by comprehensively analyzing data from multiple regions. These examples include the effect of solar coronal holes on the Earth’s geomagnetic activity and the interaction between solar wind, magnetosphere, ionosphere and neutral atmosphere. The former study investigated long-term trends of coronal boles, solar wind parameters, and Earth’s geomagnetic indices during two solar cycles. It showed the possibility that the solar wind speed and geomagnetic activities may be controlled by the size and latitudinal distribution of coronal holes. The latter analyzed multi-instrument data simultaneously obtained from interplanetary space, magnetosphere, and ionosphere and mesosphere in both northern and southern hemispheres. They newly found that the polar mesosphere is affected by relativistic electron precipitation caused by the interaction with magnetospheric plasma waves during the high-speed solar wind stream. These studies demonstrate that sharing and comprehensive analysis of long-term, multiple-sphere, and multi-instrument data using sophisticated tools are very effective to produce scientific outcomes. At present there are data gap areas in the Asia and African regions. Therefore, we believe that filling in the data gap by international collaborations could be a breakthrough for unsolved issues in the upper atmosphere.