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- W2051223904 abstract "In this paper we conduct a data survey searching for well-defined streamer wave events observed by the Large Angle and Spectrometric Coronagraph (LASCO) on-board the Solar and Heliospheric Observatory (SOHO) throughout Solar Cycle 23. As a result, eight candidate events are found and presented here. We compare different events and find that in most of them the driving CMEs’ ejecta are characterized by a high speed and a wide angular span, and the CME–streamer interactions occur generally along the flank of the streamer structure at an altitude no higher than the bottom of the field of view of LASCO C2. In addition, all front-side CMEs have accompanying flares. These common observational features shed light on the excitation conditions of streamer wave events. We also conduct a further analysis on one specific streamer wave event on 5 June 2003. The heliocentric distances of four wave troughs/crests at various exposure times are determined; they are then used to deduce the wave properties like period, wavelength, and phase speeds. It is found that both the period and wavelength increase gradually with the wave propagation along the streamer plasma sheet, and the phase speed of the preceding wave is generally faster than that of the trailing ones. The associated coronal seismological study yields the radial profiles of the Alfvén speed and magnetic field strength in the region surrounding the streamer plasma sheet. Both quantities show a general declining trend with time. This is interpreted as an observational manifestation of the recovery process of the CME-disturbed corona. It is also found that the Alfvénic critical point is at about 10 R⊙, where the flow speed, which equals the Alfvén speed, is ∼ 200 km s−1." @default.
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- W2051223904 date "2011-07-21" @default.
- W2051223904 modified "2023-09-27" @default.
- W2051223904 title "Streamer Wave Events Observed in Solar Cycle 23" @default.
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- W2051223904 doi "https://doi.org/10.1007/s11207-011-9814-6" @default.
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