Publications

Scientific publications, articles and reports

Main Factors Influencing Climate Change: A Review

MAIN FACTORS INFLUENCING CLIMATE CHANGE: A REVIEW

Todor Nikolov, Nikola Petrov

Solar cycle

 

Astronomy Calendar of Celestial Events 2013

Astronomy Calendar 2013

The Astronomy calendar includes data for some general celestial events during 2013. In all reports, time and date are in universal time (UT) calculated for Sofia, Bulgaria. More reports generated by Astronomy Lab 2 for Windows, marked on the page as astron.lab. Time is in 24 hour format.

 

 

Abbreviations used in reports:

AU                        – Astronomical Units (150 000 000 km)

Astronomy Calendar of Celestial Events 2011

Astronomy Calendar of Celestial Events 2011
 
The Astronomy calendar includes data for some general celestial events during 2011. 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. In all reports, times and dates are in standard time for Sofia, Bulgaria
or explicit is written Universal Time (UT). Times are in 24 hour format.
 

Zodiacal Light from Rozhen

The Zodiacal light as seen for 4 different nights from NAO Rozhen, Bulgaria. By Emil Ivanov, camera Canon 40D with 10mm F/4.0 and 20mm F/1.8 lenses, 13 - 16 September 2010

Video: 

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

Video: 

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.

Video: 

Astronomy Calendar of Celestial Events 2010

In all reports, times and dates are in standard time for Sofia, Bulgaria
 
Sofia
Latitude:           42°41'05" N
Longitude:        23°19'10" E
Local Time = UT +   2:00 hours
Elevation:         560 meters
 
 
More reports generated by Astronomy Lab, marked as astron. lab
(corrected by daylight savings time or summer time).
Times are in 24 hour format.
 

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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