H
α Observations of 8 June, 2004 Venus Transit |
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| Authors: | Ashok Ambastha B Ravindra Sanjay Gosain |
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| Institution: | (1) Udaipur Solar Observatory, Physical Research Laboratory, P.O. Box 198, Udaipur, 313001, India |
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| Abstract: | 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 H α 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 H α. We report that the “black-drop” effect is present in H α 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 H α images with the multi-wavelength data obtained from the TRACE satellite. |
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