Solar wind diagnostics from Doppler-enhanced scattering
1987; IOP Publishing; Volume: 315; Linguagem: Inglês
10.1086/165172
ISSN1538-4357
AutoresG. Noci, John L. Kohl, G. L. Withbroe,
Tópico(s)Solar Radiation and Photovoltaics
Resumoview Abstract Citations (230) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar Wind Diagnostics from Doppler-enhanced Scattering Noci, Giancarlo ; Kohl, John L. ; Withbroe, George L. Abstract Solar wind ions can attain sufficient outflow speed, w, to cause line excitation by chromospheric or transition region radiation in a nearby line. It is shown that this extends the diagnostic possibilities of a coronal EUV line to much larger values of w than would be possible if pumping were limited to radiation from the same spectral line. For the 1037.6 A coronal line of O VI, the pumping effect of the chromospheric C II 1037.0 A line is efficient for w between 100 and 250 km/s. An approximate expression for the line ratio for a doublet of the Li or Na isoelectronic sequences is derived, and the diagnostic capabilities of doublet line ratios, either by themselves or combined with the observation of other quantities, are discussed. In particular, that the determination of doublet line ratios at several heights can be sufficient to yield the solar wind velocity at those heights together with a constraint on other coronal parameters. Publication: The Astrophysical Journal Pub Date: April 1987 DOI: 10.1086/165172 Bibcode: 1987ApJ...315..706N Keywords: Doppler Effect; Light Scattering; Plasma Diagnostics; Solar Wind; Ultraviolet Spectra; Abundance; Solar Corona; Solar Spectra; Solar Wind Velocity; Spectrum Analysis; Solar Physics; PLASMAS; SUN: CORONA; SUN: SOLAR WIND; SUN: SPECTRA; ULTRAVIOLET: SPECTRA full text sources ADS |
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