Search Publications
Global model of the corona with heat and momentum addition
Wu, S. T.; Poletto, G.; Suess, S. T. +1 more
We have been developing a series of global coronal models directed at a better simulation of empirical coronal hole and streamer properties. In a previous study, a volumetric heat source was used to produce a thin current sheet above streamers and high solar wind speed in the coronal hole. This improved the preexisting coronal structure for corona…
Solar wind measurements with SOHO: The CELIAS/MTOF proton monitor
Hsieh, K. C.; Wurz, P.; Bochsler, P. +26 more
The proton monitor, a small subsensor in the Charge, Element, and Isotope Analysis System/Mass Time-of-Flight (CELIAS/MTOF) experiment on the SOHO spacecraft, was designed to assist in the interpretation of measurements from the high mass resolution main MTOF sensor. In this paper we demonstrate that the proton monitor data may be used to generate…
Thermal coupling of protons and neutral hydrogen in the fast solar wind
Habbal, Shadia R.; Allen, Lorraine A.; Hu, You Q.
We investigate the coupling between neutral hydrogen atoms and protons in the corona for a range of proton temperatures reaching a maximum of 6×106K, as recently inferred from observations of the Ly α spectral line profiles by Kohl et al. [1996]. We adopt the approach used by Olsen et al. [1994], whereby the neutral hydrogen atoms are t…
Kinetic properties of solar wind minor ions and protons measured with SOHO/CELIAS
Wurz, P.; Bochsler, P.; Geiss, J. +14 more
Using observations of the Charge Time-of-Flight (CTOF) charge and mass spectrometer of the Charge, Element and Isotope Analysis System (CELIAS), and of CELIAS/proton monitor on board the Solar and Heliospheric Observatory (SOHO), we present an overview of speeds and kinetic temperatures of minor ions and protons in the solar wind near solar minimu…
Iron freeze-in temperatures measured by SOHO/CELIAS/CTOF
Livi, S.; Hsieh, K. C.; Wurz, P. +26 more
The CELIAS particle experiment on SOHO contains the Charge Time Of Flight (CTOF) mass spectrometer which measures the ionic and elemental composition of minor ions in the solar wind. In this paper we present iron freeze-in temperatures derived with a time resolution of 5 min. They indicate that some of the filamentary structures of the inner coron…
First-year continuous solar EUV irradiance from SOHO by the CELIAS/SEM during 1996 solar minimum
Galvin, A. B.; Judge, D. L.; Ogawa, H. S. +2 more
The CELIAS/SEM photodiode spectrometer aboard SOHO continuously monitors the full-disk EUV solar irradiance in an 8-nm wavelength band centered at 30.4 nm (first order), and in a broad wavelength band between 0.1 and 77 nm (central order). We present the absolute solar EUV irradiances for the 1996 solar EUV minimum year at 1 AU. The uncertainty in…
Preliminary retrieval of solar wind latitude distribution from Solar Wind Anisotropies/SOHO observations
Schmidt, W.; Quemerais, E.; Bertaux, J. -L. +5 more
The Solar Wind Anisotropies (SWAN) instrument on board the SOHO spacecraft measures Lyman alpha radiation emanating mainly from neutral hydrogen gas in the solar neighborhood. This gas is part of the local interstellar cloud in which the Sun and the heliosphere are immersed. Measurements of Lyman alpha can be used to infer the local cloud characte…
Magnesium isotopic composition as observed with the CELIAS/MTOF experiment on the SOHO spacecraft
Livi, S.; Hsieh, K. C.; Wurz, P. +27 more
Solar wind abundance ratios of magnesium isotopes measured with the high resolution Mass Time-of-Flight spectrometer (MTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO) are presented. MTOF, as part of CELIAS, is, because of its high time and mass resolution, an excel…