OFFSETS IN THE GEOMAGNETIC INDICES OF THE MAGNETOSPHERIC RING CURRENT
Аннотация и ключевые слова
Аннотация (русский):
The paper considers changes in the daily average values of the Dst, SYM-H, ASY-H, and ASY-D indices and their dependence on the level of magnetic disturbance for the period 1981–2016. These indices are geomagnetic characteristics of the magnetospheric ring current. It has been established that the indices of the asymmetric component of the ring current АSY-H and АSY-D during relatively magnetically quiet periods are not equal to zero. The values of the offsets in the dependences of the ASY-H and ASY-D indices on the level of magnetic disturbance have been determined. The behavior of the index of the degree of symmetry of the ring current, the ratio SYM-H/ASY-H, is analyzed during the year at different levels of disturbance. This ratio has been found to grow in absolute value with increasing disturbance and to exceed 1 at large disturbances (at Dst<–50).

Ключевые слова:
geomagnetic index Dst, geomagnetic indices SYM and ASY, magnetospheric ring current
Текст
Текст произведения (PDF): Читать Скачать
Список литературы

1. Alexeev I.I., Belenkaya E.S., Kalegaev V.V., Feldstein Y.I., Grafe A. Magnetic storms and magnetotail currents. J. Geophys. Res. 1996, vol. 101, no. A4, рр. 7737–7747. DOI: 10.1029/ 95JA03509.

2. Bazarzhapov A.D., Matveev M.I., Mishin V.M. Geomagnitnye variatsii i buri [Geomagnetic Variations and Storms]. Novosibirsk, Nauka Publ., 1979, 248 p. (In Russian).

3. Dubyagin S., Ganushkina N., Kubyshkina M., Liemohn M. Contribution from different current systems to SYM and ASY midlatitude indices. J. Geophys. Res. 2014, vol. 119, pp. 7243–7263. DOI: 10.1002/2014JA020122.

4. Greenspan M.E., Hamilton D.C. A test of the Dessler-Parker-Sckopke relation during magnetic storms. J. Geophys. Res. 2000, vol. 105, no. A3, рр. 5419–5430. DOI: 10.1029/ 1999JA000284.

5. Haiducek J.D., Welling D.T., Ganushkina N.Y., Morley S.K., Dogacan Su Ozturk. SWMF global magnetosphere simulations of January 2005: Geomagnetic indices and cross-polar cap potential. Space Weather. 2017, vol. 15, pp. 1567–1587. DOI: 10.1002/2017SW001695.

6. Hakkinen L.V.T., Pulkkinen T.I., Pirjola R.J., Nevanlinna H., Tanskanen E.I., Turner N.E. Seasonal and diurnal variation of geomagnetic activity: Revised Dst versus external drivers. J. Geophys. Res. 2003, vol. 108, iss. A2, 1060. DOI: 10.1029/2002JA009428.

7. Iyemori T., Araki T., Kamei T., Takeda M. Mid-latitude geomagnetic indices ASY and SYM (Provisional) No. 1 (1989–1990). Internal Report of Data Analysis Center for Geomagnetism and Space Magnetism. Kyoto University, Japan, 1992.

8. Iyemori T., Takeda M., Nose M., Odagi Y., Toh H. Mid-latitude geomagnetic indices “ASY” and “SYM” for 2009 (Provisional). Internal Report of Data Analysis Center for Geomagnetism and Space Magnetism. Kyoto University, Japan, 2010. Available at http://wdc.kugi.kyoto-u.ac.jp/aeasy/asy.pdf (accessed October 5, 2020).

9. Jorgensen A.M., Spence H.E., Hughes W.J., Singer H.J. A statistical study of the global structure of the ring current. J. Geophys. Res. 2004, vol. 109, A12204. DOI: 10.1029/2003JA010090.

10. Kalegaev V.V., Ganushkina N.Y., Pulkkinen T.I., Kubyshkina M.V., Singer H.J., Russell C.T. Relation between the ring current and the tail current during magnetic storms. Ann. Geophys. 2005, vol. 23, рр. 523–533. DOI: 10.5194/angeo-23-523-2005.

11. Makarov G.A. Geometric factor in seasonal variations of daily average values of the geomagnetic index Dst. Solar-Terr. Phys. 2020, vol. 6, iss. 4, pp. 50–56. DOI: 10.12737/stp-64202008.

12. Maltsev Y.P., Arykov A.A., Belova E.G., Gvozdevsky B.B., Safargaleev V.V. Magnetic flux redistribution in the storm time magnetosphere. J. Geophys. Res. 1996, vol. 101, no. A4, рр. 7697–7704. DOI: 10.1029/95JA03709.

13. Mursula K., Karinen A. Explaining and correcting the excessive semiannual variation in the Dst index. Geophys. Res. Lett. 2005, vol. 32, L14107. DOI: 10.1029/2005GL023132.

14. Shi Y., Zesta E., Lyons L.R., Yumoto K., Kitamura K. Statistical study of effect of solar wind dynamic pressure enhancements on dawn-to-dusk ring current asymmetry. J. Geophys. Res. 2006, vol. 111, A10216. DOI: 10.1029/2005JA011532.

15. Sugiura M., Kamei T. Equatorial Dst index 1957–1986. IAGA Bull. 1991, no. 40, 14 p.

16. Temerin, M., Li X. Dst model for 1995–2002. J. Geophys. Res. 2006, vol. 111, A04221. DOI: 10.1029/2005JA011257.

17. Tsyganenko N.A., Sitnov M.I. Modeling the dynamics of the inner magnetosphere during strong geomagnetic storms. J. Geophys. Res. 2005. vol. 110, A03208. DOI: 10.1029/2004 JA010798.

18. Turner N.E., Baker D.N., Pulkkinen T.I., McPherron R.L. Evaluation of the tail current contribution to Dst. J. Geophys. Res. 2000, vol. 105, no. A3, pp. 5431–5439. DOI: 10.1029/1999JA000248.

19. Weygand J.M., McPherron R.L. Dependence of ring current asymmetry on storm phase. J. Geophys. Res. 2006, vol. 111, A11221. DOI: 10.1029/2006JA011808.

20. URL: http://wdc.kugi.kyoto-u.ac.jp/dstdir/index.html (accessed October 5, 2020).

Войти или Создать
* Забыли пароль?