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Plasma Properties in Coronal Holes Derived from Measurements of Minor Ion Spectral Lines and Polarized White Light Intensity
- R. Esser, S. Fineschi, M. Guhathakurta
- Physics
- 1998
Recent observations of the Lyα λ1216, Mg X λ625, and O VI λ1038 spectral lines carried out with the Ultraviolet Coronagraph Spectrometer (UVCS) on board SOHO at distances in the range 1.35-2.1 RS in…
The Effect of Temperature Anisotropy on Observations of Doppler Dimming and Pumping in the Inner Corona
Recent observations of the spectral line profiles and intensity ratio of the O VI λλ1032 and 1037.6 doublet by the Ultraviolet Coronagraph Spectrometer (UVCS) on the Solar and Heliospheric…
Thermal coupling of protons and neutral hydrogen in the fast solar wind
- Lorraine A. Allen, S. Habbal, Y. Hu
- Physics
- 1 May 1997
We investigate the coupling between neutral hydrogen atoms and protons in the corona for a range of proton temperatures reaching a maximum of 6 × 106 K, as recently inferred from observations of the…
Experimental constraints on pulsed and steady state models of the solar wind near the Sun
- W. Feldman, S. Habbal, G. Hoogeveen, Y.-M. Wang
- Physics
- 1 December 1997
Ulysses observations of the high-latitude solar wind were combined with Spartan 201 observations of the corona to investigate the nature and extent of uncertainties in our knowledge of solar wind…
Spatial and temporal variations of EUV coronal bright points
- S. Habbal, G. Withbroe
- Physics
- 1981
This paper reports results of an analysis of Skylab observations of coronal bright points made in EUV spectral lines formed in the chromosphere, chromospheric-coronal transition region and corona.…
Resonant acceleration and heating of solar wind ions by dispersive ion cyclotron waves
We investigate the preferential acceleration and heating of solar wind alpha particles by the resonant cyclotron interaction with parallel-propagating left-hand-polarized ion cyclotron waves. The…
Are coronal holes the only source of fast solar wind
[1] A two-dimensional (2-D) MHD model of an Alfven-wave-driven solar wind in the heliospheric meridional plane is presented whereby the consequences of a magnetic field distribution at the Sun that…
Electron kinetic firehose instability
The linear dispersion equation describing electromagnetic waves propagating in a homogeneous electron-proton plasma along arbitrary directions relative to the direction of the background magnetic…
The Depiction of Coronal Structure in White-Light Images
The very steep decrease in density with heliocentric distance makes imaging of coronal density structures out to a few solar radii challenging. The radial gradient in brightness can be reduced using…
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