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Scientific publications, articles and reports

Astronomy Calendar of Celestial Events 2010
The Astronomy calendar includes data for some general celestial events during 2010. In all reports, times and dates are in standard time for Sofia, Bulgaria. More reports generated by Astronomy Lab 2 for Windows, marked on the page as astron. lab.  Hall information that shows fixed time (seasons, sunrise/set moonrise/set, planet ephemerides etc.) is corrected by daylight savings time or summer time. Time is in 24 hour format.
 
Sofia coordinates location:
Latitude: 42°41'05" N, Longitude: 23°19'10" E, Elevation: 560 meters

Local Time = UT + 2:00 hours

From dusk to dawn at Rozhen

A whole night at Rozhen National Astronomical Observatory. 8.09.2010
Time lapse - 25 sec frames. Combined from 764 individual images Canon 40 D camera with 20mm Sigma lenses at F/1.8. Photography by Nikola Petrov and Emil Ivanov

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A starry night at NAO Rozhen

The whole starry night at NAO Rozhen, Bulgaria, images taken with Canon 40D camera and 18mm f/1,8 lenses.

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A list of the papers by years published by members of the Department “Sun” (1984-2010)

Here is a list of the papers by years published by members of the Department “Sun” (1984-2010), as well as earlier solar publications made in the Institute of Astronomy and in Department “Astronomy” of the Faculty of Physics of Sofia University “St. Kliment Ohridski”. 

New Lyot coronagraph at NAO – Rozhen: presents and perspectives

 

New Lyot coronagraph at NAO – Rozhen: presents and perspectives
Petrov N., Duchlev P., Kokotanekova J.
Institute of Astronomy, Bulgarian Academy of Science, Sofia, Bulgaria, nikipetrov@yahoo.com
Abstract. A new Lyot type coronagraph for prominence observations was assembled in June 2005 at the National Astronomical Observatory – Rozhen, Bulgaria. A short description and parameters of the instrument, as well as its testing and improving during the observations are presented. The results from the observations quiescent and active prominences are presented and discussed, too. The scientific objectives and future applications of the coronagraph are considered.
 
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