Journal ArticleDOI
Observations of the solar corona in polarized white light during the total solar eclipse of February 16, 1980 Preliminary results
TLDR
In this article, the authors used a polaroid filter oriented in three directions 60 degrees apart to estimate the total intensity, degree of polarization, and direction of the electric vector of the corona.Abstract:
Photographic observations of the corona were made by a Belgian expedition to Kenya during the eclipse of 1980, February 16, using a polaroid filter oriented in three directions 60 ° apart. The preliminary results of the reduced data are presented here; these results consist in the analysis of the three following parameters: total intensity, degree of polarization, direction of the electric vector. The local variation of these parameters reveals, among other features, a deep coronal hole at the south pole and peculiar streamer (P.A. 280 °) associated to a transient, (the so-called ‘tennis racket’) also observed by other teams, and a density enhancement at P.A. 200 °, possibly associated with a transient observed with the K-coronameter of the High Altitude Observatory 12 hr before the eclipse.read more
Citations
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Journal ArticleDOI
Evidence for magnetic disconnection of mass ejections in the corona
David F. Webb,Edward W. Cliver +1 more
TL;DR: In this paper, the authors performed a systematic search for candidate magnetic disconnection features, defined as transient large-scale, concave-outward bright regions usually following the CME leading edge, using both ground-based solar eclipse and spaceborne coronagraph data.
Journal ArticleDOI
Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe
Stanimir Stankov,Nicolas Bergeot,David Berghmans,David Bolsée,Carine Bruyninx,Jean-Marie Chevalier,Frédéric Clette,Hugo De Backer,Johan De Keyser,Elke D'Huys,Marie Dominique,Joseph Lemaire,Jasmina Magdalenic,Christophe Marqué,Nuno Pereira,Viviane Pierrard,Danislav Sapundjiev,Daniel B. Seaton,Koen Stegen,Ronald Van der Linden,Tobias Verhulst,Matthew J. West +21 more
TL;DR: In this paper, a detailed review of the eclipse geometry proves that considering the actual obscuration level and solar zenith angle at ionospheric heights is much more important for the analysis than at the commonly referenced Earth's surface or at the plasmaspheric heights.
Journal ArticleDOI
Coronal Photopolarimetry with the LASCO-C2 Coronagraph over 24 Years [1996 – 2019]
TL;DR: In this paper, the polarimetric analysis of the white-light images made use of polarized sequences composed of three images obtained though three polarizers oriented at ��$+60^{\circ }$�, ��€$0^{\Circ }$¯¯¯¯, and ¯¯¯¯€€€$-60^{circ }€€�, complemented by a neighboring unpolarized image.
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Polarization of the white-light corona and its large-scale structure in the period of solar cycle maximum
TL;DR: In this paper, the distribution of brightness and polarization for the February 16, 1980 solar corona was obtained, and a theoretical interpretation of the observed high degrees of polarization, taking into account the data on coronal brightness is very difficult.
Journal ArticleDOI
White-Light Polarization and Large-Scale Coronal Structures
TL;DR: The results of the white-light polarization measurements performed during three solar eclipses (1973, 1980, and 1991) are presented in this article, where the authors investigated the behavior of the polarization in dependence on heliocentric distance in helmet streamers and coronal holes.
References
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Journal ArticleDOI
Coronal activity below 2 solar radii - 1980 February 15-17
R. R. Fisher,Arthur I. Poland +1 more
TL;DR: In this paper, a new ground-based K-coronameter and a prominence monitor on Mauna Loa in Hawaii were used to make use of the area between the solar surface and 2.0 solar radii.
Journal ArticleDOI
Numerical calculation of Thomson scattering from inhomogeneous models of the corona, and application to streamers of the 1970 and 1972 eclipses
J. D. Bohlin,L. M. Garrison +1 more
TL;DR: In this paper, a general computer program was developed to numerically integrate the Thomson scattered light from arbitrary inhomogeneous models of the solar corona, and the tangential and radial components (Ktand Kr) were calculated.
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Observations and discussions concerning high polarization features in the solar corona.
TL;DR: In this paper, the radial and tangential polarization of the solar corona for the 1970, March 7, solar eclipse was photographed using a neutral density filter and rotating linear polaroid sectors to allow the polarization structure to be seen from 1 to 6 solar radii.
Journal ArticleDOI
Electrons in the solar corona. I. Electron density models of streamers at eclipse 15 February 1961
TL;DR: In this paper, the electron densities of coronal streamers were determined using the Thompson scattering of the solar light in the optical range, and the electron-density repartition within these streamers was derived.