Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM11] Effects of recurrent storms: from the heliosphere to the atmosphere

Thu. May 24, 2018 10:45 AM - 12:15 PM 303 (3F International Conference Hall, Makuhari Messe)

convener:ALEXEI DMITRIEV(Institute of Space Science, National Central University, Jungli City, Taiwan), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Chairperson:Miyoshi Yoshizumi(ISEE, Nagoya University)

11:45 AM - 12:00 PM

[PEM11-05] First observation of mesosphere response to the geomagnetic forcing

*Wen Yi1,4,2, Xianghui Xue1,4,5, Iain Reid3,2, Joel Younger3,2, Andrew Spargo2, Damian Murphy6, Tingdi Chen1,4, Xiankang Dou1 (1.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, 2.School of Physical Sciences, University of Adelaide, Adelaide, 3.ATRAD Pty Ltd., Thebarton, South Australia, Australia, 4.Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China, 5.Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, China, 6.Australian Antarctic Division, Kingston, Tasmania, Australia)

Keywords:meteor radar, mesospheric density, solar wind, solar wind high speed stream

We present a first observation and analysis of 13.5, 9 and 6.75-day periodic oscillations observed in the neutral mesosphere density in the declining phase of solar cycle 23 and 24. Mesospheric densities near 90 km are derived using data from the Davis meteor radar (68.5°S, 77.9°E), Antarctica. Spectral analysis indicates that the pronounced periodicities of 13.5, 9 and 6.75 days observed in the mesosphere densities are associated with variations in solar wind high-speed streams and recurrent geomagnetic activities. A Morlet wavelet analysis shows that the time evolution of the 13.5, 9- and 6.75-day oscillations in the neutral mesosphere densities are similar to those in the solar wind and in planetary magnetic activity index, Kp. These results demonstrate a direct coupling between the upper atmosphere (corona) of the Sun and the Earth’s mesosphere.