No evidence of a circumsolar dust ring from infrared observations of the 1991 solar eclipse

Details No evidence of a circumsolar dust ring from infrared observations of the 1991 solar eclipse No evidence of a circumsolar dust ring from infrared observations of the 1991 solar eclipse

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257.1377l&link_type=abstract

Science (ISSN 0036-8075), vol. 257, no. 5075, Sept. 4, 1992, p. 1377-1380. Research supported by CNRS, INSU, NSF, et al.

Other

24

Circumsolar Telescopes, Interplanetary Dust, Solar Corona, Solar Eclipses, Polarization (Waves), Solar Radiation

Scientific paper

Large-format IR array detectors are employed to map the solar corona out to large angular distances from the sun during the 1991 eclipse, and the images are used to confirm the absence of a circumsolar dust ring. An HgCdTe-array detector is employed with broadband H, J, and K filters to study wavelengths of 1-2.5 microns. An inhomogeneous structure in the K-corona is noted in the images of the H- and K-band surface brightnesses, and elliptical flattening of the F-corona is cnfirmed. The 2D IR observations are argued to provide unambiguous evidence that no circumstellar dust ring existed during the time of observation. The dynamics of the interplanetary dust particles are theorized to be the product of influences other than or in addition to those described by gravitational-radiation drag calculations. The results suggest that previous detections of dust rings do not necessarily reflect the existence of 'local' coronal dust rings.

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