Solar Flare Effects on 150‐km Echoes Observed Over Jicamarca: WACCM‐X Simulations
Solar Flare Effects on 150‐km Echoes Observed Over Jicamarca: WACCM‐X Simulations
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DOI：
10.1029/2019gl084790
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
N. Pedatella;J. Chau;J. Vierinen;L. Qian;P. Reyes;E. Kudeki;G. Lehmacher;M. Oppenheim
中科院分区：
文献类型：
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作者：
N. Pedatella;J. Chau;J. Vierinen;L. Qian;P. Reyes;E. Kudeki;G. Lehmacher;M. Oppenheim
利用Jicamarca射电天文台的观测资料和具有热层-电离层扩展（WACCM - X）模拟的全大气群落气候模型，研究了2005年9月7日X - 17太阳耀斑对150公里回波、电子密度和垂直等离子体漂移的影响。太阳耀斑在观测到的150公里的回波和模拟的电子密度中产生了非常相似的响应。这些结果为背景电子密度与150公里回波中的层状结构之间的关系提供了额外的证据。模拟还捕获了观测中看到的垂直等离子体漂移速度的类似快速下降。然而，模拟的等离子体垂直漂移的变化比观测到的在京马卡马卡经度的减少要弱，尽管京马卡马卡以东的变化更强。太阳耀斑对等离子体垂直漂移的影响主要归因于太阳耀斑期间电离增强引起的电导率变化。
Jicamarca Radio Observatory observations and Whole Atmosphere Community Climate Model with thermosphere‐ionosphere eXtension (WACCM‐X) simulations are used to investigate the effects of the 7 September 2005 X‐17 solar flare on 150‐km echoes, electron densities, and vertical plasma drifts. The solar flare produces a remarkably similar response in the observed 150‐km echoes and simulated electron densities. The results provide additional evidence of the relationship between the background electron density and the layering structure that is seen in 150‐km echoes. The simulations also capture a similar rapid decrease in vertical plasma drift velocity that is seen in the observations. The simulated change in vertical plasma drift is, however, weaker than the observed decrease at the longitude of Jicamarca, though it is stronger east of Jicamarca. The effect of the solar flare on the vertical plasma drifts is primarily attributed to changes in conductivity due to the enhanced ionization during the solar flare.