DAYSIDE DIFFUSE AURORA RESPONSE TO AN INCREASE OF SOLAR WIND DYNAMIC PRESSURE

doi:10.3724/SP.J.1084.2012.00274

Abstract

Abstract: The sudden enhancement of solar wind dynamic pressure can result in the disturbance on the flux of energetic particles precipitating into the ionosphere and the current intensity in magnetosphere-ionospheric current system. The diffuse aurora, which is excited by high-energy particles of magnetosphere precipitating into the upper atmosphere and impacting with the neutral gas, can respond to the disturbance. Because of the location of Yellow River Station (YRS) in Ny-?lesund, Svalbard is good for the optical observation of dayside aurora. A case of the dayside diffuse aurora was observed by the all-sky imager (ASI) in YRS, which intensively responds to a variety of solar wind dynamic pressure. With the enhancement of the solar wind dynamic pressure, the diffuse aurora on the equatorward of ASI’s field-of-view showed the intensity enhance and the poleward extension on latitude, the geomagnetic environment also showed a corresponding disturbance at the same time. We suggested that the dayside magnetopause is compressed because of the enhancement of the solar wind dynamic pressure. It can result in the enhancement of pitch-angle scatter by wave particle interaction in the magnetosphere. Consequently, the number flux of the high-energy particle scattering the loss-cone and precipitating into the equatorward ionosphere of auroral oval is enhanced, and led the emission increase of dayside diffuse aurora.

Key words: dayside diffuse aurora, interplanetary magnetic field, solar wind dynamic pressure, geomagnetic activity

Chen Xiangcai，Han Desheng，Hu Zejun，Liu Janjun，Hu Hongqiao，Xing Zanyang，Liu Junming，Liu Ruiyuan. DAYSIDE DIFFUSE AURORA RESPONSE TO AN INCREASE OF SOLAR WIND DYNAMIC PRESSURE[J]. ADVANCES IN POLAR SCIENCE, 2012, 24(3): 274-283.

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