Analysis On The Distribution Of Geomagnetic Storm Number
-
摘要: Dst是一个表征磁暴强度的空间天气指数. 通过统计1957-2008年 发生的中等磁暴(-100<Dst≤ -50nT)和强磁暴(Dst ≤ -100nT)在太阳活动周上升年、极大年、下降年和极小年的时间分布情 况, 分析其随季节变化的统计特性, 进而讨论了引起磁暴的原因. 结果表明, 对于同一太阳活动周, 极大年地磁暴发生次数远大于极小年地磁暴的发生次数, 这与太阳黑子数的变化趋势是一致的; 通常太阳活动周强磁暴出现双峰结构, 而第23周中等磁暴出现双峰结构, 强磁暴则出现三峰结构, 这可能与1999 年强 磁暴发生次数异常少, 使1998年凸显出来的现象有关; 磁暴主要发生在分季, 随着Dst指数的增加, 磁暴发生次数明显增加.Abstract: A geomagnetic storm is a global disturbance in Earth's magnetic field, which is caused by various solar phenomenon. Dst index is the most widely used index which denotes the intensity of magnetic storm activity. The distributions of moderate geomagnetic storms (-100<Dst≤ -50nT) and intense geomagnetic storms (Dst≤ -100nT) and their causes in 1957-2008 are identified. Moreover, annual average number of geomagnetic storm in ascending phase, maximum phase, declining phase, and minimum phase of solar activity was analyzed according to different kinds of geomagnetic storms. It is found that the total number of geomagnetic storm in maximum phase year is greater than that in minimum phase year of the same solar activity, and there is close relation between the average number of Sun spots per year and the total number of geomagnetic storm. A dominant dual-peak distribution usually exists in the solar cycle variability of intense geomagnetic storm, but a dual-peak distribution of moderate geomagnetic storm exists and a trinal-peak distribution appears in intense geomagnetic storm. The presence of the extra peak might be attributing to a typical year compared to other rising phase years. On the other hand, another possibility is that 1999 could be an unusual year, with a low rate of intense magnetic storm. The magnetic storms mainly happen in equinox, and the number of magnetic storm is obviously changed with the increased Dst index.
-
Key words:
- Geomagnetic storm /
- Solar cycle /
- Average occurrence rate /
- Sunspot number
-
[1] Sugiura M. What do we expect in magnetic activity in the current solar cycle[J]. it EOS, 1980, 61(43):673-675 [2] Gonzalez W D, Gonzalez A L C, Tsurutani B T. Dual-peak solar cycle distribution of intense geomagnetic storm[J]. it Plane. Space Sci., 1990, 38(2):181-187 [3] Rathore B S, Kaushik S C, Bhadoria R S, et al. Sunspots and geomagnetic storms during solar cycle-23[J]. it Indian J. Phys., 2012, 86(7):563-567 [4] Li Qi, Gao Yufen, Zhu Peiyu, et al. Dependence of strong magnetic storm number on solar cycle[J]. Seism. Geom. Obs. Res., 2012, 33:56-60. In Chinese (李琪, 高玉芬, 朱培育,等. 强磁暴的时间分布特性[J]. 地震地磁观测与研究, 2012, 33:56-60) [5] Gonzalez W D, Joselyn J A, Kamide Y, et al. What is a geomagnetic storm[J]. J. Geophys. Res., 1994, 99(A4):5771-5792 [6] Li H, Wang C, Kan J R. Contribution of the partial ring current to the SYM-H index during magnetic storms[J]. J. Geophys. Res., 2011, 116, A11222, doi: 10.10292011JA016886 [7] Gonzalez W D, Gonzalez A L C, Tsurutani B T. Dual-peak solar cycle distribution of intense geomagnetic linebreak storms[J]. it Planet. Space Sci., 1990, 38:181-187 [8] Echer E, Gonzalez W D, Tsrutani B T, et al. Interplanetary conditions causing intense geomagnetic storms (Dst≤ -100nT) during solar cycle 23[J]. J. Geophys. Res., 2008, 113, A05221, doi: 10.1029/2007JA012744 [9] Wu Yingyan, Tschu K K, Xu Wenyao, et al. Sheshan hundred years data of geomagnetic storms I: solar cycle variations[J]. it Chin. J. Geophys., 2009, 52(10):2595-2601. In Chinese (吴迎燕, 朱岗昆, 徐文耀, 等.余山地磁台百年磁 暴(一)elax---elax太阳周期变化[J]. 地球物理学报, 2009, bf 52(10):2595-2601) [10] hernosky E J. Double sunspot cycle variation in terrestrial magnetic activity[J]. J. Geophys. Res., 1966, 71(3):965-974 [11] Plunkett S P, Thompson B J, Cyr O C St, et al. Solar source regions of coronal mass ejections and their geomagnetic effects[J]. J. Atmos. Solar Terr. Phys., 2001, bf 63:389-402 [12] Richardon I G, Cane H V, Cliver E W. Sources of geomagnetic activity during nearly three solar cycles (1972-2000)[J]. J. Geophys. Res., 2002, 107, doi:10. 1029/2001JA000 [13] Tsurutani B T, Gonzalez W D. The cause of geomagnetic storms during solar maximum[J]. EOS, 1994, 75(5):49-56 [14] Baker D N. Effects of the Sun on the Earth's environ-ment[J]. J. Atmos. Sol. Terr. Phys., 2000, 62:1669-1681 [15] Tong Yanan, Liu Siqing, Gong Jiancun. Analysis on the interplanetary causes of moderate geomagnetic storms during the whole 23rd solar cycle[J]. Chin. J. Space Sci., 2008, 28(6):513-512. In Chinese (佟亚男, 刘四清, 龚建村. 第23太阳活动周中等地磁暴行星际源的统计分析[J]. 空间科学学报, 2008, 28(6):513-512) [16] Su Zengpeng, Xiong Ming, Zheng Huinan, et al. Propagation of interplanetary shock and its consequent geoeffectiveness[J]. Chin. J. Geophys., 2009, 52(3):591-598. In Chinese (苏振鹏, 熊明, 郑惠南, 等. 行星际激波的传播及其相应的地磁效应. 地球物理学报, 2009, 52(3):591-598) [17] Wang Yuming, Ye Pinzhong, Wang Shui. An interplanetary origin of great geomagnetic storms: Multiple magnetic clouds[J]. Chin. J. Geophys., 2004, 47(3):369-375. In Chinese (汪毓明, 叶品中, 王水. 特大地磁暴的一种行星际源: 多重磁云[J]. 地球物理学报, 2004, 47(3):369-375)
点击查看大图
计量
- 文章访问数: 1051
- HTML全文浏览量: 36
- PDF下载量: 1635
- 被引次数: 0