arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2312.03381astro-ph.SRastro-ph.EPastro-ph.HEphysics.space-ph
收藏

与2006年12月13日日冕物质抛射事件相关的地冕太阳风电荷交换过程

Geocoronal Solar Wind Charge Exchange Process Associated with the 2006-December-13 Coronal Mass Ejection Event

Yu Zhou, Noriko Y. Yamasaki, Shin Toriumi, Kazuhisa Mitsuda

AI总结:

针对2006年12月13日CME事件,研究利用多条高电离离子非热发射线确认地冕SWCX信号,并揭示其与磁云到达、北半球磁层尖点及太阳风流方位各向异性的关联。

摘要:

我们报告发现了一个地冕太阳风电荷交换(SWCX)事件,该事件对应于著名的2006年12月13日日冕物质抛射(CME)事件。能量为O⁷⁺、Ne⁹⁺、Mg¹¹⁺、Si¹²⁺、Si¹³⁺的显著非热发射线,为这种瞬态漫射发射的电荷交换起源提供了有力证据。特别是,探测到一条0.53 keV的发射线,它极有可能来自N⁵⁺的1s¹5p¹→1s²跃迁。此前,利用质子耀斑预报SWCX发生的可行性一直存在争议。在这一特定事件中,我们发现SWCX信号与CME内部磁云的到达相吻合,并在CME激波锋面穿过地球时,在质子通量波动之后经过一段时延而被触发。此外,SWCX光变曲线中的航天器轨道调制表明,发射产生于地球附近。研究发现视线始终穿过北半球磁层尖点。当视线穿过尖点的昏侧时,SWCX强度较高,这表明尖点内部太阳风离子流存在方位各向异性。研究发现,轴对称SWCX发射模型将观测到的峰值强度低估了约50倍。我们认为,这种差异与尖点内太阳风流的方位各向异性有关。

英文摘要:

We report the discovery of a geocoronal solar wind charge exchange (SWCX) event corresponding to the well-known 2006 December 13th coronal mass ejection (CME) event. Strong evidence for the charge exchange origin of this transient diffuse emission is provided by prominent non-thermal emission lines at energies of $\rm O^{7+}$, $\rm Ne^{9+}$, $\rm Mg^{11+}$, $\rm Si^{12+}$, $\rm Si^{13+}$. Especially, a 0.53 keV emission line that most likely arises from the $\rm N^{5+}$ $1s^1 5p^1 \to 1s^2$ transition is detected. Previously, the forecastability of SWCX occurrence with proton flares has been disputed. In this particular event, we found that the SWCX signal coincided with the arrival of the magnetic cloud inside CME, triggered with a time delay after the proton flux fluctuation as the CME shock front passed through the Earth. Moreover, a spacecraft orbital modulation in SWCX light curve suggests that the emission arises close to the Earth. The line of sight was found to always pass through the northern magnetospheric cusp. The SWCX intensity was high when the line of sight passed the dusk side of the cusp, suggesting an azimuthal anisotropy in the flow of solar-wind ions inside the cusp. An axisymmetric SWCX emission model is found to underestimate the observed peak intensity by a factor of about 50. We suggest this discrepancy is related to the azimuthal anisotropy of the solar-wind flow in the cusp.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑