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Case study of small scale polytropic index in the central plasma sheet
Cao, JinBin; Wang, Jing; Yang, JunYing +8 more
This paper studies the effective polytropic index in the central plasma sheet (CPS) by using the method of Kartalev et al. (2006), which adopts the denoising technique of Haar wavelet to identify the homogeneous MHD Bernoulli integral (MBI) and has been frequently used to study the polytropic relation in the solar wind. We chose the quiet CPS cros…
Plasma draining and replenishing near a solar active region inferred from cross-correlation between radiation intensity and Doppler shift
Wang, Xin; Zhang, JingBo; He, JianSen +3 more
Using observations from the EUV Imaging Spectrometer (EIS) onboard Hinode, we exam the plasma dynamics around the edge of the active region 10977, possibly associated with the source of nascent slow/intermediate solar wind. The correlation between the temporal profiles of the radiation intensity and Doppler shift for each emission line are analyze…
Global frequency distributions of pulsations driven by sharp decrease of solar wind dynamic pressure
Wang, Zhi Qiang
On 24 August 2005, an impulse of solar wind dynamic pressure (Psw) hit the magnetosphere. Using the high resolution geomagnetic field data from 15 ground stations and the data from Geotail and TC-1, we studied the geomagnetic pulsations at auroral latitudes driven by the sharp decrease of Psw at the trailing edge of the impulse. The results show t…