Polarisation in the night sky at 5,300 Å

Details Polarisation in the night sky at 5,300 Å Polarisation in the night sky at 5,300 Å

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.252..215b&link_type=abstract

Nature, Volume 252, Issue 5480, pp. 215-216 (1974).

Statistics

5

Scientific paper

WE have presented observations1 of the linearly polarised intensity, pI, at 5,080 Å (that is, polarisation, p × intensity, I), of radiation in the night sky. Contour plots of pI showed a displacement of the minimum of pI away from the antisolar point (ASP). A significant angular structure, and day-to-day variations were also evident. Here, we report observations of pI and of the orientation angle, χ, of the polarisation plane of radiation at 5,300 Å in the night sky. Measurements have been taken since May 1973 with a photoelectric polarimeter at the University of Hawaii (J. L. Weinberg, unpublished). Several modifications have been made recently, the most important being the analog-digital conversion of data recording. Digitisation allows faster data reduction and improves measurement precision, which is now limited by instrumental polarisation and photon statistics. Full data will be published elsewhere; here, we discuss 63 nights of observation from May 1973-June 1974.

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