Solar irradiance, cosmic rays and cloudiness over daily timescales
Latest publications
Autor Jaša Čalogović Utorak, 20 Prosinac 2011 00:00
Although over centennial and greater timescales solar variability may be one of the most influential climate forcing agents, the extent to which solar activity influences climate over shorter time periods is poorly understood. If a link exists between solar activity and climate, it is likely via a mechanism connected to one (or a combination) of the following parameters: total solar irradiance (TSI), ultraviolet (UV) spectral irradiance, or the galactic cosmic ray (GCR) flux. We present an analysis based around a superposed epoch (composite) approach focusing on the largest TSI increases and decreases (the latter occurring in both the presence and absence of appreciable GCR reductions) over daily timescales...
GRL website
Cosmic ray modulation by different types of solar wind disturbances
Latest publications
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.
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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.
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further details & registration
First announcement - XIIth Hvar Astrophysical Colloquium
Latest news
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 announcementfurther details & registration
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