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A Mechanism for the STEVE Continuum Emission

机译：史蒂夫连续性排放的机制

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摘要

We describe a mechanism to explain the subauroral emission feature called STEVE (Strong Thermal Emission Velocity Enhancement), with a focus on its continuum spectrum. Spacecraft observations show that emissions co-occur with typically invisible plasma flows known as subauroral ion drifts. If these flows are fast enough, nitrogen molecules are vibrationally excited by collisions with ions, overcoming the activation energy of the N-2+O -> NO+N reaction. The resulting NO combines with ambient O, producing NO2 and spectrally broad light. Importantly, this mechanism also produces N, which reduces the lifetime of NO from hours to seconds and thus explains why the emission is confined to a discrete arc. The predicted emission altitude (greater than or similar to 130 km) and occurrence conditions (greater than or similar to 4-km/s flows) match well with observations. We simulate this mechanism using a simple photochemical model to demonstrate its validity. This mechanism is initiated by fast ion flows and is thus distinct from auroral and airglow processes.
机译：我们描述了一种解释称为史蒂夫（强热排放速度增强）的亚宝葵发射特征的机制，重点关注其连续频谱。航天器观察表明，由于诸如亚前列离子漂移的通常看不可见的等离子体流量，则排放共同发生。如果这些流量足够快，则通过与离子的碰撞造成振动激发的氮分子，克服N-2 + O-> NO + N-反应的活化能量。由此产生的没有与环境o组合，产生NO2和光谱宽光。重要的是，该机制也产生n，这减少了不超过几小时秒的寿命，因此解释了发射被限制在离散弧中。预测的发射高度（大于或类似于130km）和发生条件（大于或类似于4厘米或类似的流量）与观察结果相匹配。我们使用简单的光化学模型模拟该机制来展示其有效性。通过快速离子流引发该机制，因此不同于极光和防空工艺。

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