Response of the middle atmosphere to the solar proton events of August-December, 1989
Response of the middle atmosphere to the solar proton events of August-December, 1989
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DOI：
10.1029/91gl01049
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发表时间：
1991-06
影响因子：
5.2
通讯作者：
G. Reid;S. Solomon;R. Garcia
中科院分区：
文献类型：
--
作者：
G. Reid;S. Solomon;R. Garcia
1989 年 8 月至 12 月期间强烈的太阳活动引发了几次重大的高能粒子事件，伴随着两个半球极地区域的电离率和 NO{sub y} 产量的大大提高。中层大气化学和动力学的二维模型已用于计算 NO{sub y} 的产生和随后的命运及其对臭氧浓度和温度的影响。在阳光照射的南极冰帽中，在 60 公里高度附近，NO 增加了 20 倍，柱密度增加了 55%。据计算，1989 年 10 月下旬，40 公里附近的臭氧消耗峰值约为 20%，预计气温下降约 3-3.5 K。由于在事件高峰期缺乏阳光，北极地区的影响要小得多。
Intense solar activity during the period August-December 1989 gave rise to several major energetic-particle events, which were accompanied by greatly enhanced ionization rates and NO{sub y} production in the polar regions of both hemispheres. A two-dimensional model of the chemistry and dynamics of the middle atmosphere has been used to calculate the production and subsequent fate of the NO{sub y} and its effect on ozone concentrations and temperatures. In the sunlit southern polar cap, NO increases as large as a factor of 20 are estimated near 60 km altitude, with column density enhancements of 55%. Corresponding peak ozone depletions of about 20% are calculated near 40 km in late October 1989, with predicted temperature decreases of about 3-3.5 K. Effects in the northern polar regions are considerably smaller, due to the lack of sunlight during the peak phase of the events.