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Investigation of Hemispherical Variations of Soft X-Ray Solar Flares during Solar Cycles 21 to 24
Solar System Research ( IF 0.9 ) Pub Date : 2021-04-08 , DOI: 10.1134/s0038094621020052
Amrita Prasad , Soumya Roy , Koushik Ghosh , Subhash Chandra Panja , Sankar Narayan Patra

Abstract

In the current investigation we have studied the distribution as well as the asymmetry of solar X-ray flares during the period 1976–2017 which corresponds to solar cycle 21, 22, 23 and the almost complete solar cycle 24. The study of the N–S distribution of soft X-ray flares during solar cycles 21, 22, 23 and 24 reveals that the 10°–20° latitude band produced maximum number of soft X-ray flares and is found to be southern hemisphere dominated during all the considered cycles. The soft X-ray flares events above 40° latitude is very rare. Most of the solar X-ray flare activities are observed to be concentrated in the 8°–30° latitude band. A time-latitude plot has been plotted to graphically represent the soft X-ray flare distribution at various latitudes over the course of solar cycle. Our analysis also reveals that solar cycles 21, 22 and 23 are southern hemisphere dominated and the corresponding probability value is statistically significant. The soft X-ray solar flare activity during solar cycle 24 is also found to be southern hemisphere dominated, similar to cycles 21, 22 and 23. Using cross-correlation analysis, we have found that the smoothed curves of the number of soft X-ray flares in northern hemisphere are ahead of the southern hemisphere by 10 months, 2 months, 8 months and 4 months during solar cycles 21, 22, 23 and 24 respectively. Also, for total time span (1976–2017), the smoothed curve of the frequency of soft X-ray flares in northern hemisphere is ahead of a similar curve from the southern hemisphere by 7 months.



中文翻译:

太阳周期21至24期间软X射线太阳耀斑的半球变化研究

摘要

在目前的研究中,我们研究了1976-2017年期间太阳X射线耀斑的分布以及不对称性,这对应于太阳周期21、22、23和几乎完整的太阳周期24。在太阳周期21、22、23和24中,软X射线耀斑的S分布表明,纬度10°–20°产生了最大数量的软X射线耀斑,并且在所有考虑的周期中南半球均占主导地位。纬度超过40°的软X射线耀斑事件非常少见。观察到大多数太阳X射线耀斑活动都集中在8°–30°纬度带。绘制了一个时间纬度图,以图形方式表示了整个太阳周期过程中各种纬度下的软X射线耀斑分布。我们的分析还表明,太阳周期21 22和23以南半球为主,相应的概率值具有统计学意义。与周期21、22和23相似,在太阳周期24中的软X射线太阳耀斑活动也被发现是南半球主导的。使用互相关分析,我们发现软X-射线数量的平滑曲线在太阳周期21、22、23和24期间,北半球的射线耀斑比南半球提前10个月,2个月,8个月和4个月。同样,在整个时间跨度(1976-2017年)中,北半球软X射线耀斑频率的平滑曲线比南半球类似的曲线提前了7个月。与周期21、22和23相似,在太阳周期24中的软X射线太阳耀斑活动也被发现是南半球主导的。使用互相关分析,我们发现软X-射线数量的平滑曲线在太阳周期21、22、23和24期间,北半球的射线耀斑比南半球提前10个月,2个月,8个月和4个月。同样,在整个时间跨度(1976-2017年)中,北半球软X射线耀斑频率的平滑曲线比南半球类似的曲线提前了7个月。与周期21、22和23相似,在太阳周期24中的软X射线太阳耀斑活动也被发现是南半球主导的。使用互相关分析,我们发现软X-射线数量的平滑曲线在太阳周期21、22、23和24期间,北半球的射线耀斑比南半球提前10个月,2个月,8个月和4个月。同样,在整个时间跨度(1976-2017年)中,北半球软X射线耀斑频率的平滑曲线比南半球类似的曲线提前了7个月。我们发现,在太阳周期21、22、23和24期间,北半球X射线耀斑数量的平滑曲线分别比南半球提前了10个月,2个月,8个月和4个月。同样,在整个时间跨度(1976-2017年)中,北半球软X射线耀斑频率的平滑曲线比南半球类似的曲线提前了7个月。我们发现,在太阳周期21、22、23和24期间,北半球X射线耀斑数量的平滑曲线分别比南半球提前了10个月,2个月,8个月和4个月。同样,在整个时间跨度(1976-2017年)中,北半球软X射线耀斑频率的平滑曲线比南半球类似的曲线提前了7个月。

更新日期:2021-04-09
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