A new processing method for the AE index

Science in China Series E: Technological Sciences - Tập 51 - Trang 1713-1720 - 2008
LingQian Zhang1, ZhenXing Liu1, ZhiWei Ma2, W. Baumjohann3, Jian Wu4, M. Dunlop5, JianKui Shi1, Li Lu1, JiYe Wang6
1Centre for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China
2Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China
3Space Research Institute, Austrian Academy of Sciences, Graz, Austria
4China Research Institute of Radiowave Propagation, Beijing, China
5Space Sciences Division, Rutherford Appleton Laboratory, Chilton, Didcot, UK
6Physics and Electron Engineering Academy, Central National University, Beijing, China

Tóm tắt

In this paper, we introduce an effective processing method to acquire the time derivative of the AE index as a coefficient. Using this coefficient, the AE index can be divided into the four stages: quiet, ascending, descending and active stages. The statistical results show that the ascending and descending stages of the AE index are dominant and occupy two thirds of the whole period. An analysis of the relationship between the occurrence frequencies of the Dst index and AE index in solar cycle 23 shows that the monthly variation of the occurrence frequencies of the ascending stage of AE is closely related to the decrease of the Dst index.

Tài liệu tham khảo

Davis T N, Sugiura M. Auroral electrojet index AE and its universal time variations. J Geophys Res, 1966, 71: 785–801 Akasofu S I. The development of the auroral substorm. Planet Space Sci, 1964, 12: 273–282 Baumjohann W. Merits and limitations of the use of geomagnetic indices in solar wind-magnetosphere coupling studies. In: Kamide Y, Slavin J A, eds. Solar Wind-Magnetosphere Coupling. Tokyo: Terra Scientific, 1986. 3–15 Weiss L A, Reiff P H, Moses J J, et al. Energy dissipation in substorms, in Substorms 1. ESA, 1992. 309–318 Akasofu S I. Energy coupling between the solar wind and the magnetosphere. Space Sci Rev, 1981, 28: 121–190 Rostoker G, Akasofu S I, Baumjohann W, et al. The roles of direct input of energy from the solar wind and unloading of stored magnetotail energy in driven magnetospheric substorms. Space Sci Rev, 1987, 46: 93–111 Elphinstone R D, Murphree J S, Cogger L L. What is a global auroral substorm? Rev Geophys, 1996, 34: 169–232 Baker D N, Pulkkinen T I, Hesse M, et al. A quantitative assessment of energy storage and release in the Earth’s magnetotail. J Geophys Res, 1997, 102: 7195–7168 Baumjohann W, Paschmann G, Sckopke N, et al. Average ion moments in the plasma sheet boundary layer. J Geophys Res, 1988, 93: 11507–11520 Baumjohann W, Paschmann G, Cattell C A. Average plasma properties in the center plasma sheet. J Geophys Res, 1989, 94: 6597–6606 Rostoker G. Geomagnetic indices. Rev Geophys Space Phys, 1972, 10: 935–950 Kamide Y, Akasofu S I. Notes on the auroral electrojet indices. J Geophys Res, 1983, 71: 1647–1656 Akasofu S I, Ahn B H, Kamide Y, et al. A note on the accuracy of the auroral electrojet indices. J Geophys Res, 1983, 88: 5769–5772 Murayama T, Hakamada K. Effects of solar wind parameters on the development of magnetospheric substorms. Planet Space Sci, 1975, 23: 75–91 Iyemori T, Maeda H, Kamei T. Impulse response of geomagnetic indices to interplanetary magnetic fields. J Geomag Geoelectr, 1979, 31: 1–9 Maltsev Y P. Points of controversy in the study of magnetic storms. Space Sci Rev, 2004, 110: 227–277 Maltsev Y P, Golovchanskaya I V. Parameters influencing the growth and decay of the regular part of the AE index. Geomagn Aeron, 2006, 46: 18–25 Gonzalez W D, Joselyn J A, Kamide Y, et al. What is a geomagnetic storm? J Geophys Res, 1994, 99: 5771 McPherron R L. The role of substorm in the generation of magnetic storms in magnetic storms. Am Geophys Union Geophys Monogr Ser, 1997, 98: 131 Kamide Y, Baumjohann W, Daglis I A, et al. Current understanding of magnetic storms: Storm/substorm relationships. J Geophys Res, 1998, 103: 705 Shen C, Liu Z X. A physics-based study of the Dst-AL relationship. J Geophys Res, 2002, 107, doi:10.1029/2001JA900121