Effects of EMIC Wave‐Driven Proton Precipitation on the Ionosphere
Effects of EMIC Wave‐Driven Proton Precipitation on the Ionosphere
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DOI：
10.1029/2021ja030101
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
X. Tian;Yiqun Yu;Minghui Zhu;Long Ma;Jinbin Cao;Shreedevi Pr;V. Jordanova;S. Solomon
中科院分区：
文献类型：
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作者：
X. Tian;Yiqun Yu;Minghui Zhu;Long Ma;Jinbin Cao;Shreedevi Pr;V. Jordanova;S. Solomon
利用自洽环流-大气相互作用模式(RAM-SCBE)和电离层粒子输运模式全球气辉(GLOW)，研究了电磁离子回旋波(EMIC)引起的质子沉淀及其对电离层的影响。EMIC波的扩散过程导致了数十keV质子的显著降水，特别是在下午到午夜区域。这些析出的高能质子进一步影响电离层-热层，并有助于E/F区的电离。在黄昏到午夜区域，极光综合电导显著增强。虽然EMIC波并不直接与环流电子相互作用，但在考虑EMIC波散射后，全球降水电子通量的分布发生了显著变化。这意味着EMIC波驱动的质子沉淀的加入对环流电子动力学通过循环系统产生反馈效应。通过将模拟的降水通量和电离层电子密度与观测值进行比较，也进行了验证。
We investigate the proton precipitation caused by electromagnetic ion cyclotron (EMIC) waves and its impact on the ionosphere with the self‐consistent ring current‐atmosphere interactions model (RAM‐SCBE) coupled with an ionospheric particle transport model Global Airglow (GLOW). The EMIC wave diffusion process causes significant precipitation of tens of keV protons, particularly in the afternoon to midnight sector. These precipitating energetic protons further impact the ionosphere‐thermosphere and contribute to the ionization in the E/F regions. The integrated auroral conductance is significantly enhanced in the dusk‐to‐midnight sector. Although the EMIC waves do not directly interact with the ring current electrons, after the EMIC wave scattering included in the model, remarkable changes are found in the global distribution of precipitating electron flux. This means that the addition of proton precipitation driven by EMIC waves results in feedback effects on the ring current electron dynamics through the circulation system. Validation is also conducted by comparing the simulated precipitation flux and ionospheric electron density with observations.