Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Dependence of Quiet Time Geomagnetic Activity Seasonal Variation on the Solar Magnetic Polarity

  • Oh, Suyeon (Department of Astronomy and Space Science, Chungnam National University)
  • Received : 2013.01.31
  • Accepted : 2013.02.15
  • Published : 2013.03.15
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Abstract

The geomagnetic activity shows the semiannual variation stronger in vernal and autumnal equinoxes than in summer and winter solstices. The semiannual variation has been explained by three main hypotheses such as Axial hypothesis, Equinoctial hypothesis, and Russell-McPherron Effect. Many studies using the various geomagnetic indices have done to support three main hypotheses. In recent, Oh & Yi (2011) examined the solar magnetic polarity dependency of the geomagnetic storm occurrence defined by Dst index. They reported that there is no dependency of the semiannual variation on the sign of the solar polar fields. This study examines the solar magnetic polarity dependency of quiet time geomagnetic activity. Using Dxt index (Karinen & Mursula 2005) and Dcx index (Mursula & Karinen 2005) which are recently suggested, in addition to Dst index, we analyze the data of three-year at each solar minimum for eight solar cycles since 1932. As a result, the geomagnetic activity is stronger in the period that the solar magnetic polarity is anti-parallel with the Earth's magnetic polarity. There exists the difference between vernal and autumnal equinoxes regarding the solar magnetic polarity dependency. However, the difference is not statistically significant. Thus, we conclude that there is no solar magnetic polarity dependency of the semiannual variation for quiet time geomagnetic activity.

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References

  1. Ahn BH, Moon GH, Seasonal and universal time variations of the AU, AL and Dst indices, JKAS, 36, S93-S99 (2003).
  2. Bartels J, Eine universelle Tagsperiode der erdmagnetischen Aktivitat, Meteorol. Z., 42, 147-152 (1925).
  3. Bohlin JD, Extreme-ultraviolet observations of coronal holes, Sol. Phys., 51, 377-398 (1977). https://doi.org/10.1007/BF00216373
  4. Chapman S, Bartels J, Geomagnetism, Vol. 2 (Oxford Univ. Press, London, 1940), 601.
  5. Cliver EW, Kamide Y, Ling AG, Mountains versus valleys: Semiannual variation of geomagnetic activity, JGR, 105, 2413-2424 (2000). http://dx.doi.org/10.1029/1999JA900439
  6. Cliver EW, Kamide Y, Ling AG, Yokoyama N, Semiannual variation of the geomagnetix Dst index: Evidence for a dominant nonstorm component, JGR, 106, 21297-21304 (2001). https://doi.org/10.1029/2000JA000358
  7. Cliver EW, Svalgaard L, Ling AG, Origins of the semiannual variation of geomagnetic activity in 1954 and 1996, Ann. Geophys., 22, 93-100 (2004). https://doi.org/10.5194/angeo-22-93-2004
  8. Cortie AL, Sunspots and terrestrial magnetic phenomena, 1898?1911: The cause of the annual variation in magnetic disturbances, MNRAS, 73, 52-60 (1912). https://doi.org/10.1093/mnras/73.1.52
  9. Gonzalez WD, Joselyn JA, Kamide Y, Kroehl HW, Rostoker G, et al., What is a geomagnetic storm?, JGR, 99, 5771-5792 (1994). https://doi.org/10.1029/93JA02867
  10. Karinen A, Mursula K, A new reconstruction of the dst index for 1932-2002, Ann. Geophys., 23, 475-485 (2005). https://doi.org/10.5194/angeo-23-475-2005
  11. Karinen A, Mursula K, Correcting the dst index: Consequences for absolute level and correlations, JGR, 111, A08207 (2006). http://dx.doi.org/10.1029/2005JA011299
  12. Lui ATY, McEntire RW, Krimigis SM, Evolution of the ring current during two geomagnetic storms, JGR, 92, 7459-7470 (1987). https://doi.org/10.1029/JA092iA07p07459
  13. Mursula K, Karinen A, Explaining and correcting the excessive semiannual variation in the dst index, GeoRL, 32, L14107 (2005). http://dx.doi.org/10.1029/2005GL023132
  14. Mursula K, Tanskanen E, Love JJ, Spring-fall asymmetry of substorm strength, geomagnetic activity and solar wind: Implications for semiannual variation and solar hemispheric asymmetry, GeoRL, 38, L06104, doi: 10.1029/2011GL046751 (2011).
  15. Oh SY, Yi Y, Relationships of the solar wind parameters with the magnetic storm magnitude and their association with the interplanetary shock, JKAS, 37, 151-157 (2004).
  16. Oh SY, Yi Y, Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence, JGR, 116, A06101 (2011). http://dx.doi.org/10.1029/2010JA016362
  17. Russell CT, McPherron RL, Semiannual variation of geomagnetic activity, JGR, 78, 92-108 (1973). http://dx.doi.org/10.1029/JA078i001p00092
  18. Sugiura M, Hourly values of equatorial Dst for the IGY, Ann. Int. Geophys. Year, Vol. 35 (Pergamon Press, Oxford, 1964), 9.
  19. Sugiura M, IAGA Resolution 2, in IAGA Bulletin, Vol. 27 (ISGI Publ. Office, Madrid, 1969), 123.
  20. Sugiura M, Kamei T, Equatorial Dst index 1957-1986, in IAGA Bulletin Vol. 40, ed. Berthelier A and Menvielle M (ISGI Publ. Office, Saint-Maur-des-Fosses, 1991).
  21. Svalgaard LE, Geomagnetic activity: Dependence on solar wind parameters, in Coronal Holes and High Speed Wind Streams, ed. Zirker JB (Colo. Assoc. Univ. Press, Boulder, 1977), 371.
  22. Svalgaard LE, Geomagnetic semiannual variation is not overestimated and is not an artifact of systematic solar hemispheric asymmetry, GeoRL, 38, L16107 (2011). http://dx.doi.org/10.1029/2011GL048616
  23. Svalgaard LE, Cliver W, Ling AG, The semiannual variation of great geomagnetic storms, GeoRL, 29(16) (2002). http://dx.doi.org/10.1029/2001GL014145

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