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Dissipation and wave-ion interaction in the solar wind: Links between fluid and kinetic theory
Marsch, E.
In this paper we establish links between turbulence dissipation and wave-particle interactions in the solar corona and wind. Based on quasilinear theory, a set of anisotropic, multi-component fluid equations is derived, which describe the wave-particle interactions of ions with Alfvén waves and ion-cyclotron waves or magnetosonic waves propagating…
Heating the Solar Corona by Magnetic Reconnection
Priest, E. R.
Here I review briefly the theory of magnetohydrodynamic reconnection and ask what observational evidence is there that it is heating the corona. In particular, the new directions in which three-dimensional theory for reconnection is heading are outlined. Part of the coronal heating problem has been solved with the identification of reconnection dr…
Dynamics of polar plumes observed at the 1998 February 26 eclipse
Gurman, J. B.; Lites, B. W.; Elmore, D. F. +5 more
This paper presents first observations of dynamics of the white-light solar corona detected during the few minutes of totality of a solar eclipse. Perturbations of a polar plume associated with an embedded `jet' structure observed simultaneously at 195 Å with the EUV Imaging Telescope (EIT) aboard the SOHO spacecraft lead to estimates of the elect…
Three years of Ulysses dust data: 1993-1995
Krüger, H.; Srama, R.; Hamilton, D. P. +18 more
The Ulysses spacecraft is orbiting the Sun on a highly inclined ellipse (i = 79°). After its Jupiter flyby in 1992 at a heliocentric distance of 5.4 AU, the spacecraftreapproached the inner solar system, flew over the Suns south polar region in September 1994,crossed the ecliptic plane at a distance of 1.3 AU in March 1995, and flew over the Suns …
Supernova Remnants in the Magellanic Clouds. II. Supernova Remnant Breakouts from N11L and N86
Chu, You-Hua; Smith, R. Chris; Winkler, P. Frank +3 more
The evolution of a supernova remnant (SNR) is heavily influenced by the interstellar conditions surrounding the remnant. This is particularly true in cases where the SNR is breaking out into a low-density area in the surrounding medium. We examine two promising candidates for the study of SNR breakouts in the Large Magellanic Cloud (LMC): N11L and…
The ISO spectrum of the planetary nebula NGC 6302. I. Observations
Pottasch, S. R.; Beintema, D. A.
The spectrum of the planetary nebula NGC 6302 is presented, as it was observed by the ISO short-wavelength spectrometer. The IUE spectrum observed at the same position with the same aperture is also presented.
Metallicity-dependent effective temperature determination for eclipsing binaries from synthetic UVBY Strömgren photometry
Westera, P.; Buser, R.; Lastennet, E. +1 more
Strömgren synthetic photometry from an empirically calibrated grid of stellar atmosphere models has been used to derive the effective temperature of each component of double lined spectroscopic (SB2) eclipsing binaries. For this purpose, we have selected a sub-sample of 20 SB2s for which (b-y), m_1, and c_1 individual indices are available. This n…
Optical and ROSAT X-ray observations of the dwarf nova OY Carinae in superoutburst and quiescence
Hassall, B. J. M.; Naylor, T.; Wood, Janet H. +2 more
We present ROSAT X-ray and optical light curves of the 1994 February superoutburst of the eclipsing SU UMa dwarf nova OY Carinae. There is no eclipse of the flux in the ROSAT HRI light curve. Contemporaneous `wide B'-band optical light curves show extensive superhump activity and dips at superhump maximum. Eclipse mapping of these optical light cu…
The electron heat flux in the polar solar wind: Ulysses observations
Scime, Earl E.; Littleton, J. E.; Badeau, Allen E., Jr.
Ulysses measurements of the solar wind electron heat flux as a function of heliographic latitude are presented. Contamination from a light leak at the highest latitudes has been removed from the data by interpolating between uncontaminated pixels. After normalization by the radial gradient in the electron heat flux obtained during the inecliptic p…
An investigation of the fine ray structure of the coronal streamer belt using LASCO data
Eselevich, M. V.; Eselevich, V. G.
It is shown that within R>3-4 R⊙from the solar center the coronal streamer belt consists in a sequence of radial brightness rays. A minimum angular size of the individual ray d≈2.0°-2.5°, which is about the same in the directions normal to and along the streamer-belt, is independent of the distance from the Sun at R=4-6 R⊙…