Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jbaa..117...65m&link_type=abstract
Journal of the British Astronomical Association, vol.117, no.2, p.65-76
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The year 2004 was exceptional in producing the first solar transit of Venus since the late Victorian era. The bright aureole and atmospheric ring were re-observed, and the entire phenomenon was witnessed for the first time ever in hydrogen alpha light. Although routine observations throughout 2004 were unexceptional, patterns of visibility of bright and dark markings, cusp extensions and cusp-caps were recorded. No correlation was found between the latitude of the sub-Earth point and the visibility of either cusp-cap, with the S. cap predominating for most of the year. It was possible to accurately follow individual ultraviolet dark markings over many consecutive rotations, extending from the E. to W. elongations, and thereby to make a current measurement of the synodic atmospheric rotation period for the near-equatorial features: 3.996 ± 0.001 days. The true Ashen Light was reported visually on only a few occasions, but these correspond closely to times when infrared emission from the surface of the dark side was recorded in 1-micron waveband images. Some of the stable dark side albedo features were also visible upon the 1-micron images, and have been tentatively identified with known surface features. Infrared imaging at the same waveband showed little detail on the sunlit disk, but a few bright spots were sufficiently well observed to suggest a synodic rotation period close to 5.0 days, not atypical for the lower cloud decks.
Blaxall K.
Heath A.
McKim R. J.
No associations
LandOfFree
Venus 2004: east and west elongations and solar transit does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Venus 2004: east and west elongations and solar transit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Venus 2004: east and west elongations and solar transit will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1083599