Venus transit on 6.6.2012 – Hvar solar telescope observations

Autor Jaša Čalogović Srijeda, 06 Lipanj 2012 16:37

During the morning hours of 6.6.2012, Hvar Observatory double solar telescope was able to observe and record the last Venus transit in this century. Photospheric and chromosperic telescope were used from the sunrise (3:44 UTC) till the end of transit (4:55 UTC). Unfortunately for those who missed it, the next Venus transit will not occur until December 2117. Observer was Nikša Novak and data were processed by Jaša Čalogović.

> Short movies generated from the telescope data can be accessed here

Online talk - Can solar activity and cosmic rays save us from global warming?

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Autor Jaša Čalogović Nedjelja, 01 Travanj 2012 23:02

All those interested in solar influences on climate and especially in the contended topic about link between the cosmic rays and clouds can now online access the talk of Jaša Čalogović held on IAC, La Laguna on 15. March 2012.

> Click here for the abstract and video of the talk

Solar irradiance, cosmic rays and cloudiness over daily timescales

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Autor Jaša Čalogović Utorak, 20 Prosinac 2011 00:00

Cosmic ray modulation by different types of solar wind disturbances

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Autor Mateja Dumbovic Utorak, 20 Prosinac 2011 00:00

The amount of the galactic cosmic rays (primarily protons) that hit the Earth is greatly influenced by the solar activity. On the short time scales it can be substantially reduced by the passing of solar wind disturbances, such as interplanetary coronal mass ejections (ICMEs) and corotating interaction regions (CIRs). The resulting short-term cosmic ray depressions are generally denoted as Forbush decreases. We present a systematic statistical study of various aspects of Forbush decreases. The analysis is based on ground-based neutron monitor data and the in-situ solar wind data recorded by the Advanced Composition Explorer (ACE) satellite and provides empirical background for physical interpretations of short-term cosmic ray modulations.

 read publication (A&A website)

First announcement - XIth Hvar Astrophysical Colloquium

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Utorak, 01 Studeni 2011 03:12

At the occasion of the 40th anniversary of Hvar Observatory, XIth Hvar Astrophysical Colloquium: The Most Mysterious Binaries: Significance for Astrophysics will be organized from 2. to 6. July 2012  in Town Loggia, Hvar, Croatia. The scientific sessions will include topics:  Binaries as Tests of Stellar Evolution Models, Extreme and Unusual Binaries, Rapid Phases of Binary Evolution, Be Binaries and Highest to Lowest Mass Binaries. Deadline for a regular registration is 15. March 2012 (150 EUR) where after this deadline the late registration will be charged with 200 EUR.

 first announcement
 further details & registration 

First announcement - XIIth Hvar Astrophysical Colloquium

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Utorak, 01 Studeni 2011 03:12

At the occasion of the 40th anniversary of Hvar Observatory, XIIth Hvar Astrophysical Colloquium: The Sun and Heliosphere will be organized from 3. to 7. September 2012  in Town Loggia, Hvar, Croatia. The scientific sessions will include following topics: The Solar Photosphere - Theory and Observations, The Chromosphere - Link between the Photosphere and Corona, Eruptive Processes, CME's and Energetic Particles, Solar-terrestrial Connection and the Heliosphere, Observing Techniques, Data Analysis and Archives.
 
 first announcement
 further details & registration