A survey of gradual solar energetic particle events
A survey of gradual solar energetic particle events
复制标题
渐进式太阳高能粒子事件的调查
DOI：
10.1029/2010ja016133
复制
发表时间：
2011
影响因子：
--
通讯作者：
M. Lockwood
中科院分区：
文献类型：
--
作者：
L. Barnard;M. Lockwood
[1]我们开发了一个110个渐进的太阳高能粒子（SEP）事件的数据库，在1967年至2006年期间，提供事件的发生，持续时间，通量和能量E> 60 MeV的质子的峰值通量的估计。数据库的建立主要是从分布在OMNI 2数据集的高能质子通量数据，但是，我们也利用麦克默多中子监测器和高能质子通量从GOES任务。为了支持渐变SEP数据库的开发，我们建立了一种提高高能质子通量记录均匀性的方法。其他SEP数据库和这里开发的数据库之间的比较，讨论了不同的算法来定义一个事件。此外，我们调查的变化，逐步SEP的发生和通量与太阳活动周期的相位，太阳黑子数（SSN），和行星际磁场强度（Bmag）在太阳活动周期20 - 23。我们发现SEP事件的发生和影响随太阳活动周期阶段而变化。相应地，我们发现SEP的发生和太阳活动之间的正相关关系确定的SSN和BMAG，而在个别事件的平均通量减少与太阳活动的相同措施。因此，虽然当太阳活动较低时，事件的数量会减少，但在这种时候发生的事件具有较高的能量密度。因此，像“卡林顿耀斑”这样的大型事件可能更有可能发生在太阳活动水平较低的地方。这些结果进行了讨论的背景下，其他类似的调查。
[1] We develop a database of 110 gradual solar energetic particle (SEP) events, over the period 1967–2006, providing estimates of event onset, duration, fluence, and peak flux for protons of energy E > 60 MeV. The database is established mainly from the energetic proton flux data distributed in the OMNI 2 data set; however, we also utilize the McMurdo neutron monitor and the energetic proton flux from GOES missions. To aid the development of the gradual SEP database, we establish a method with which the homogeneity of the energetic proton flux record is improved. A comparison between other SEP databases and the database developed here is presented which discusses the different algorithms used to define an event. Furthermore, we investigate the variation of gradual SEP occurrence and fluence with solar cycle phase, sunspot number (SSN), and interplanetary magnetic field intensity (Bmag) over solar cycles 20–23. We find that the occurrence and fluence of SEP events vary with the solar cycle phase. Correspondingly, we find a positive correlation between SEP occurrence and solar activity as determined by SSN and Bmag, while the mean fluence in individual events decreases with the same measures of solar activity. Therefore, although the number of events decreases when solar activity is low, the events that do occur at such times have higher fluence. Thus, large events such as the “Carrington flare” may be more likely at lower levels of solar activity. These results are discussed in the context of other similar investigations.
影响因子：
5.2
作者：
Abreu J
通讯作者：
Abreu J
利用ULYSSES径向日球层场空间不变性结果计算开放太阳通量的准确性
DOI：
10.1088/0004-637x/701/2/964
发表时间：
2009
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Lockwood M
通讯作者：
Lockwood M