Hα Observations of 8 June, 2004 Venus Transit

Details Hα Observations of 8 June, 2004 Venus Transit Hα Observations of 8 June, 2004 Venus Transit

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..233..171a&link_type=abstract

Solar Physics, Volume 233, Issue 1, pp.171-184

Physics

Scientific paper

The cosmic event of Venus transit across the solar disk occurred on 8 June, 2004. The previous such event was witnessed about 122 years ago on 6 December, 1882. We observed this rare transit in Hα 6563 Å line-center from Udaipur Solar Observatory (USO) using both the full-disk and small field-of-view solar telescopes. In the earlier historical transits, a “black-drop” effect was observed in white light images, during the contact phases. The transit of 8 June, 2004 provided a unique opportunity to observe this effect, for the first time, in Hα. We report that the “black-drop” effect is present in Hα also, as in the white light observations made by the ground-based Global Oscillation Network Group (GONG) instrument and the space-borne Transition Region and Coronal Explorer (TRACE) satellite. We did not observe any noticeable “aureole” (atmospheric glow) around Venus during the ingress or egress phases. We have compared the Hα images with the multi-wavelength data obtained from the TRACE satellite.

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