1,2,5,6,7,9,10,- 1Beihang University, beijing, China (yanlishalaman@gmail.com)
- 2Key Laboratory of Space Environment Monitoring and Information Processing of MIIT, Beihang University, Beijing, China
- 3School of Earth and Space Sciences, Peking University, Beijing, China.
- 4Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece
- 5Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA.
- 6Kyoto University, Kyoto, Japan
- 7Department of Geophysics, Tohoku University, Aoba-ku, Sendai, Miyagi, 980-8578, Japan.
- 8Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan.
- 9Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
- 10Kyung Hee University, Suwon, Korea
- 11Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, 252-5210, Japan
- 12Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan.
Ultra-low frequency (ULF) waves play a critical role in energy transport within the magnetosphere-ionosphere (M-I) coupling system. Using approximately 7-years of Arase satellite observations, we perform a comprehensive statistical analysis of the field aligned Poynting flux (S//) in the Pc5 band in the inner magnetosphere. A pronounced enhancement in S// at higher latitudes is consistent with the trend inferred from the product of electric and magnetic wave amplitudes modeled by Cummings et al. (1969). Comparison between inward and outward fluxes reveals a net energy flux toward the ionosphere, indicating energy dissipation in the ionosphere. To understand the cause of this net energy flux, a simplified model illustrates how the phase difference between electric and magnetic fields (θEB) affect net S//, suggesting that phase shifts, likely induced by ionospheric dissipation, play a key role in modulating S//. Latitudinal profiles of S// and θEB for poloidal and toroidal modes at 6.82 mHz within L = 5.5 - 6.5 further demonstrate this effect of θEB on S//. The magnetic local time (MLT) dependence of S// shows pronounced day-night asymmetry at higher latitudes, with stronger fluxes on the nightside, consistent with variations in ionospheric conductance. Finally, the latitudinal distribution of S// under varying geomagnetic activity conditions exhibits systematic enhancements with increasing Kp, particularly at higher latitudes. These results provide offer insights into the dynamics of energy dissipation and transport within the M-I coupling system.
How to cite: Yan, L., Liu, W., Zhang, D., Wang, Z., Zhou, X.-Z., Sarris, T., Li, X., Tong, X., Matsuoka, A., Kasaba, Y., Kasahara, Y., Miyoshi, Y., Hori, T., Yamamoto, K., Shinohara, I., and Teramoto, M.: Characteristics of Field Aligned Poynting Flux of Pc5 ULF Wave Based on Arase Measurements, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-4885, https://doi.org/10.5194/egusphere-egu26-4885, 2026.
