题目：Shock Aurora and Its Implication

时间：2012年07月23日(星期一) 上午9：00

主讲：Xiaoyan Zhou研究员 UCLA (on leave from JPL)

地点：学术报告厅

报告简介：The global signature of shock aurora is that the aurora first brightens near local noon in the auroral zone, and then propagates anti-sunward along the auroral oval at very high ionospheric speeds, i.e.,~6 to 11 km/s. The auroral intensity can be ~10 kR or higher. Shock aurora, which is caused by interplanetary shocks or solar wind ram pressure pulses, is the most visible indication of the solar wind-magnetosphere-ionosphere coupling. This paper will present remote sensing data of the auroral activity from space and the ground and in situ observations from FAST and DMSP. Speculated mechanisms of the auroral generation and variation will be discussed. Inspired by the shock-aurora study, a new approach of imaging sunlit aurora was investigated and validated. This method proposed to employ a near-infrared camera onboard Antarctica balloon(s). As a result, dayside and conjugate auroras can be imaged and investigated.

报告人简介：

Education and research experiences

Research scientist, Jet Propulsion Laboratory, Pasadena, California, USA, 2001-present

NRC senior fellow, Jet Propulsion Laboratory, Pasadena, California, USA, 1998-2001

Scientist, Institute of Geophysics, The Chinese Academy of Sciences, Beijing, P. R. China, 1991-1998.

PhD, Institute of Geophysics, The Chinese Academy of Sciences, Beijing, P. R. China, 1991.

BS, Physics Department, Beijing Normal University, Beijing, P. R. China, 1982

Relevant publications and references therein

Zhou, X.-Y., and B.T. Tsurutani, Rapid intensification and propagation of the dayside aurora: Large scale interplanetary pressure pulses (fast shocks),Geophys. Res. Lett., 26,1097-1100, 1999.

Zhou, X.-Y., R.J. Strangeway, P.C. Anderson, D.G. Sibeck, B.T. Tsurutani, G. Haerendel, H.U. Frey, and J.K. Arballo, Shock-aurora: FAST and DMSP observations,J. Geophys. Res.,108, A4, 8019, doi:10.1029/2002JA009701, 2003.

Zhou, X.-Y.,K. Fukui,H. C. Carlson, J.I. Moen, and R.J. Strangeway,Shock Aurora: Ground-based Imager Observations,J. Geophys. Res., 114,A12, doi:10.1029/2009JA014186, 2009.

Zhou, X.-Y.,D.G. Sibeck, O. Amm, andJ.M. Ruohoniemi,Interplanetary Shock Generated Ionospheric Traveling Convection Vortex Near Local Noon,Advances in Geosciences, 21, 367-378, 2010.

Zhou, X.-Y., D. Lummerzheim, R. Gladstone, and S. Gunapala,A New Approach for Dayside Auroral Observation: NIR Camera Onboard Balloons,Geophys. Res.Lett.,34 ,L03105, doi:10.1029/ 2006GL028611, 2007.

Zhou, X.-Y., D. Lummerzheim, G.R. Gladstone, S.D. Gunapala, S.B. Bandara, J. Trihne, and L. Herrell, Magnetospheric Application of High-Altitude Long-Duration Balloon Technology: Daylight Auroral Observations,J. Adv. Space Res.,42,1676-1682, doi:10.1016/j.asr.2007. 02.034, 2008.

Research interests

- Developing a near-infrared InGaAs camera that can be onboard high-altitude and long-duration balloons to image sunlit aurora.

- Dayside, nightside and conjugate auroral phenomena to understand the solar wind - magnetosphere - ionosphere coupling and the magnetospheric dynamics

- High-latitude ionospheric electric potential patterns, corresponding electric field variations andtheJoule heating production rate of auroral electrojets.

- Characteristics of interplanetary shocks, solar wind co-rotating interaction regions (CIR),theheliospheric current sheet and plasma sheet,theenergetic particle acceleration at CIR shocks, and the auroral activity at Saturn and Jupiter.