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SOHO and radio observations of a CME shock wave
Author(s) -
Raymond John C.,
Thompson Barbara J.,
St. Cyr O. C.,
Gopalswamy Nat,
Kahler S.,
Kaiser M.,
Lara A.,
Ciaravella A.,
Romoli M.,
O'Neal R.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl003669
Subject(s) - physics , shock (circulatory) , shock wave , astrophysics , wavelength , solar wind , bow shock (aerodynamics) , coronal mass ejection , astronomy , spacecraft , optics , plasma , mechanics , medicine , quantum mechanics
A 1200 km s −1 Coronal Mass Ejection was observed with the SOHO instruments EIT, LASCO and UVCS on June 11, 1998. Simultaneously, Type II radio bursts were observed with the WAVES experiment aboard the Wind spacecraft at 4 MHz and by ground‐based instruments at metric wavelengths. The density in the shock wave implied by the higher frequency is close to that inferred from the SOHO/UVCS experiment. The drift rates of the Type II radio bursts suggest shock speeds lower than the speed derived from SOHO observations. The SOHO/UVCS spectrum shows enhanced emission in lines of O 5+ and Si 11+ , consistent with modest compression in an MHD shock.