Interplanetary shock associated aurora
Liu Jianjun1, Hu Hongqiao1, Han Desheng2 & Yang Huigen1
1SOA Key Laboratory of Polar Science, Polar Research Institute of China, Shanghai, China;
2State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai, China
Abstract: Interplanetary (IP) shocks or solar wind pressure pulses have prompt impacts on the Earth’s magnetospheric and ionospheric environment, especially in causing dynamic changes of the bright aurora in polar ionosphere. The auroral phenomenon associated with shock impingements, referred as shock aurora, exhibits distinct signature differing from other geophysical features on the dayside polar ionosphere. Shock aurora provides a direct manifestation of the solar wind-magnetosphere-ionosphere interaction. Satellite onboard imager could obtain the associated large-scale auroral characteristic during shock impingement on the magnetopause. Therefore, these satellite auroral data are very useful for surveying the comprehensive features of shock aurora and their general evolution. On the other hand, ground-based high time-spatial resolution all-sky imagers (ASI) installed at scientific stations play an essential role in revealing shock aurora in medium- and small-scale characteristic. Here, we review shock aurora mainly from the point of its imaging signature measured by satellite onboard imager and ground-based ASI.
Keywords: interplanetary shock, sudden impulse, shock aurora, wave-particle interaction, field-aligned current
Received 28-Aug-2018; Accepted 20-Dec-2018