A case study on the impact of interplanetary coronal mass ejection on the Martian O(1S) 557.7 nm dayglow emission using ExoMars TGO/NOMAD-UVIS observations: First Results

arXiv - PHYS - Space Physics Pub Date : 2024-08-02 DOI:arxiv-2408.01045

Aadarsh Raj Sharma, Lot Ram, Harshaa Suhaag, Dipjyoti Patgiri, Lauriane Soret, Jean-Claude Gerard, Ian R. Thomas, Ann Carine Vandaele, Sumanta Sarkhel

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Abstract

We report, for the first time, the impact of an interplanetary coronal mass ejection (ICME) on the recently discovered O($^1$S) 557.7 nm dayglow emission in the Martian atmosphere. Although there are only a few studies on the seasonal variation are available in the literature, the impact of ICME on 557.7 nm dayglow emission has not been investigated so far. Using the instruments aboard ExoMars-TGO and MAVEN spacecrafts, we show that the primary emission peak (75-80 km) remains unaffected during the ICME event compared to quiet-times. However, a noticeable enhancement has been observed in the brightness of secondary emission peak (110-120 km) and the upper altitude region (140-180 km). The enhancement is attributed to the increased solar electrons and X-ray fluxes, augmenting the electron-impact process and causing the enhancement in the brightness. These analyses have an implication to comprehend the role of intense solar transients like ICME on the Martian dayglow emissions.

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利用 ExoMars TGO/NOMAD-UVIS 观测数据研究行星际日冕物质抛射对火星 O(1S) 557.7 nm 日辉发射的影响：初步结果

我们首次报告了行星际日冕物质抛射（ICME）对火星大气中最近发现的O($^1$S) 557.7 nm日辉发射的影响。虽然文献中只有少数关于这些季节变化的研究，但迄今为止还没有研究过行星际日冕物质抛射对 557.7 纳米昼辉发射的影响。我们利用 ExoMars-TGO 和 MAVEN 航天器上的仪器表明，与安静时相比，ICME 事件期间的主要发射峰（75-80 公里）未受影响。然而，在次发射峰（110-120 千米）和上层高度区域（140-180 千米）观测到了明显的亮度增强。亮度增强的原因是太阳电子和 X 射线通量增加，增强了电子撞击过程，导致亮度增强。这些分析有助于理解像国际集成电路激波这样的强烈太阳瞬变对马蒂日辉辐射的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Space Physics

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