caa a22 4500 445347368 CHVBK 20180317142833.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s11207-011-9770-1 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9770-1 Mancuso Salvatore Osservatorio Astronomico di Torino, Istituto Nazionale di Astrofisica (INAF), Strada Osservatorio 20, 10025, Pino Torinese (To), Italy aut Combined Analysis of Ultraviolet and Radio Observations of the 7 May 2004 CME/Shock Event [Elektronische Daten] [Salvatore Mancuso] We report results from the combined analysis of UV and radio observations of a CME-driven shock observed on 7 May 2004 above the southeast limb of the Sun at 1.86R ⊙ with the Ultraviolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory (SOHO). The coronal mass ejection (CME) was first detected in white-light by the SOHO's Large Angle and Spectrometric Coronagraph (LASCO) C2 telescope and shock-associated typeII metric emission was recorded simultaneously by ground-based radio spectrographs. The shock speed (∼ 690km s−1), as deduced from the analysis of the typeII emission drift in the radio spectra and the pre-shock local electron density estimated with the diagnostics provided by UVCS observations of the Ovi λλ 1031.9, 1037.6 doublet line intensities, is just a factor ∼ 0.1 higher than the CME speed inferred by means of the white-light (and EUV) data in the middle corona. The local magnetosonic speed, computed from a standard magnetic field model, was estimated as high as ∼ 600km s−1, implying that the CME speed was probably just sufficient to drive a weak fast-mode MHD shock ahead of the front. Simultaneously with the typeII radio emission, significant changes in the Ovi doublet line intensities and profiles were recorded in the UVCS spectra and found compatible with abrupt post-shock plasma acceleration and modest ion heating. This work provides further evidence for the CME-driven origin of the shocks observed in the middle corona. Springer Science+Business Media B.V., 2011 Sun: radio radiation nationallicence Sun: coronal mass ejections (CMEs) nationallicence Shock waves nationallicence Line: profiles nationallicence Solar Physics Springer Netherlands 273/2(2011-11-01), 511-523 0038-0938 273:2<511 2011 273 11207 https://doi.org/10.1007/s11207-011-9770-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9770-1 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Mancuso Salvatore Osservatorio Astronomico di Torino, Istituto Nazionale di Astrofisica (INAF), Strada Osservatorio 20, 10025, Pino Torinese (To), Italy aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 273/2(2011-11-01), 511-523 0038-0938 273:2<511 2011 273 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer