Showing papers on "Solar eclipse published in 1987"
TL;DR: In this article, Pasachoff and Landman detected excess oscillatory power at 0.25-2.0 Hz in a coronal loop in the 1983 Indonesian total solar eclipse.
Abstract: We detected excess oscillatory power at 0.25–2.0 Hz in a coronal loop in the 1983 Indonesian total solar eclipse. In this second-generation experiment enlarging upon the work of Pasachoff and Landman (1984), we observed in two frequency channels, one coronal and one continuum, to monitor atmospheric and instrumental effects. We briefly discuss the effects of an oscillation near 1 Hz on the coronal heating problem.
37 citations
TL;DR: In this article, microondes resolues spatialement d'une region active complexes a 16 frequences entre 1,4 and 8 GHz, at a frequency of 16 GHz.
Abstract: Observations microondes resolues spatialement d'une region active complexes a 16 frequences entre 1,4 et 8 GHz
33 citations
TL;DR: In this paper, the polarization distribution in the sky during a total solar eclipse is calculated with a simple secondary light-scattering model using the light intensity measurements near the horizon during the eclipse and the pretotality and posttotality skylight polarization observations as input.
Abstract: The polarization distribution in the sky during a total solar eclipse is calculated with a simple secondary light-scattering model. This model uses the light-intensity measurements near the horizon during the eclipse and the pretotality and posttotality skylight polarization observations as input. It is found that the model can explain various observations during totality, including the quantitative measurements of Shaw [ Appl. Opt.14, 388 ( 1975)] of the polarization distribution of the sky in the solar vertical during the 1973 total eclipse.
18 citations
TL;DR: In this article, the electron density derived from the white light corona during the total solar eclipse of 1980 were used in the computations of fluxes for Fex (6374 A) and Fe xiv (5303 A) lines at various coronal tempratures.
Abstract: Fluxes have been computed for Fex (6374 A) and Fe xiv (5303 A) lines as a function of solar radii and at various coronal tempratures. The electron density derived from the white light corona during the total solar eclipse of 1980 were used in the computations. Fluxes in adjacent continua have also been computed. The computed ratios of line flux to the square of continuum flux at a coronal temperature of 1.6 × 106 K show a good fit with the observed values for Fex line. Further, radiative excitation seems to dominate over collisional excitation beyond 1.3 solar radius.
9 citations
TL;DR: In this paper, the authors reported accurate timing of second and third contacts made from videotape of the total solar eclipse of 23 November, 1984, observed in Papua New Guinea, and the magnitude of the discrepancies between predicted and observed times indicates that the secular change in the size of the Sun reported by some observers is within the uncertainty.
Abstract: We report accurate timing of second and third contacts made from videotape of the total solar eclipse of 23 November, 1984, observed in Papua New Guinea. The magnitude of the discrepancies between predicted and observed times indicates that the secular change in the size of the Sun reported by some observers is within the uncertainty.
5 citations
Journal Article•
TL;DR: Calcul de l'equilibre excitation-ionisation for les niveaux de SrII and H dans les conditions physiques appropriees aux spicules as discussed by the authors.
Abstract: Calcul de l'equilibre excitation-ionisation pour les niveaux de SrII et H dans les conditions physiques appropriees aux spicules
3 citations
Book Chapter•
01 Jan 1987
1 citations