XVth Hvar Astrophysical Colloquium

Written by Jaša Čalogović Sunday, 01 October 2017 00:00

HAC-XV-posterXVth Hvar Astrophysical Colloquium "45 years of Hvar Observatory and 20 years of ACT: The role of 1-m class telescopes now and in the future" will be organized from 17 to 20 October 2017 in Hotel Amfora, Hvar, Croatia. The meeting is held under the auspices of the Croatian Astronomical Society and sponsored by the Ministry of Science and Education, Republic of Croatia. The scientific sessions will include following topics: scientific results of the 1-m ACT in past 20 years, possibilities for upgrade and future observing plans, current and future collaborations.

Scientific programme

Hvar Observatory organized for the third time the Festival of Science in Hvar

Written by Jaša Čalogović Sunday, 07 May 2017 00:00

Science festival in Hvar, 2017From 25th to 27th April in the town Loggia, together with the Hvar Primary School, Split Institute of Oceanography and Fishery and Hvar High School the Festival of Science was organized for the third time in Hvar. The theme of 15th Science Festival was "time" in a chronological or meteorological sense.

Read more: Hvar Observatory organized for the third time the Festival of Science in Hvar


Hvar Observatory in VarSITI newsletter

Written by Jaša Čalogović Tuesday, 28 March 2017 13:28

thumb ISEST group2013In the VarSITI Newsletter Vol. 12 (February 2017), an overview paper on the role of the Hvar Observatory in establishing the Work Group 2 (WG2) of the ISEST project was published (B. Vršnak: "An introduction on ISEST: Working Group on Theory"). As a leader of WG2, B. Vršnak emphasized the importance of the ISEST (International Study of Earth-Affecting Solar Transients) kick-off meeting held at Hvar in June 2013, and summarized the main objectives, tasks and current research activities of WG2.

Public lecture about Space Weather for Rotary Club Zagreb

Written by Jaša Čalogović Tuesday, 28 March 2017 12:43

thumb RotaryZg 01 2017On March 21, 2017, Bojan Vršnak gave in Hotel Esplanade Zagreb a public lecture on the space weather for the Rotary Club Zagreb. In the lecture entitled "Space Weather: How to Predict Solar Storms?" ('Svemirska meteorologija': Kako predvidjeti Sunčeve oluje?), he presented basic space-weather objectives, as well as the related research activity at the Hvar Observatory.

 thumb RotaryZg 02 2017 thumb RotaryZg 03 2017 

Mateja Dumbović obtained Marie Sklodowska-Curie fellowship

Written by Mateja Dumbovic Tuesday, 21 March 2017 14:46

thumb Marie Curie logoIn the scope of individual fellowships of the Marie Sklodowska-Curie actions within EU programme HORIZON 2020 (standard European fellowships – physics panel) project "Forbush decrease model for expanding CMEs affecting Earth and Mars (ForbMod)" by M. Dumbović was accepted for funding. The subject of the project research are depressions in the galactic cosmic ray flux during solar storms (so called Forbush decreases) and the project aim is to develop a new analytical model which would explain these phenomena and compare model results with observation at Earth and Mars. The project will utilize a number of ground-based as well as spacecraft measurements including the Curiosity rover at Mars. M. Dumbović will implement this two-tear project at the University of Graz under supervision of Dr. Manuela Temmer and in collaboration with Dr. Christian Möstl from the Space Research Institute in Graz and Dr. Bernd Heber and Dr. Jingnan Guo from the Christian-Albrechts University in Kiel. A short overview of the evaluation results (Flash Call Information) is available at the EU participant portal.

Bojan Vršnak as guest in Croatian TV show "Third Element"

Written by Jaša Čalogović Tuesday, 22 November 2016 00:00

Treci element-1116-VrsnakOn November 17, 2016 Dr. Bojan Vršnak participated in the Croatian scientific TV show (HRT-3: "Third Element") entitled "Solar System". In the show, he explained the formation and evolution of the Sun, effects of the solar wind and the solar eruptive processes on the Earth and other objects in the solar system. Various solar-activity effects on the robotic and crewed space missions, including the future missions to Mars, were discussed. 

Video of TV show "Third element" on 17.11.2016 is available here (only in Croatian)


CORAMOD meeting in Zagreb

Written by Jaša Čalogović Tuesday, 15 November 2016 00:00

thumb Zagreb Obs CORAMOD 2016 The final CORAMOD project meeting was held at the Faculty of Geodesy in Zagreb from 7.-11. November 2016 where the following CORAMOD members participated: Konstantin Herbst, Adrian Vogt, Mateja Dumbović, Bojan Vršnak and Jaša Čalogović. On Thursday, 10. November 2016 Konstantin Herbst held a public lecture at Zagreb Observatory with the title: "Cosmogenic radionuclides - the quest of studying the solar activity over past 10,000 years". During the meeting in Zagreb discussions about upcoming papers that should be soon submitted and further plans for upcoming projects and collaborations were made.

Visit of the Dean to Hvar Observatory

Written by Jaša Čalogović Monday, 03 October 2016 12:35

thumb dean obs 2016 01thumb dean obs 2016 02On Moday, September 26, the Dean of the Faculty of Geodesy, prof. Damir Medak arrived to Hvar and visited Hvar Observatory to get a closer insight into activities and the life at the Observatory. Hrvoje Božić, Bojan Vršnak and Toni Visković showed the Dean solar and stellar telescopes, explained the scientific programs and strategies of the Observatory and briefed him about some infrastructural problems.

XIVth Hvar Astrophysical Colloquium

Written by Jaša Čalogović Sunday, 15 May 2016 00:00

HAC14-group-photoXIVth Hvar Astrophysical Colloquium "Solar and Solar-Terrestrial Physics: Now and in the future" will be organized from 26 to 30 September 2016 in Hvar, Croatia. The scientific sessions will include following topics: Observing techniques, Campaigns and Databases, Activity of Sun and Solar-Like Stars, Eruptive Processes in the Solar Atmosphere, Solar-Terrestrial Connection and the Heliosphere, Space Weather and Space Climate Forecasting. Abstract submission (deadline 15 July 2016) and early registration (150 EUR, deadline 1 September 20016) are now open. It is possible to apply for financial support covered trough SCOSTEP-VarSiti grant for accommodation and/or registration fee (deadline 15 June 2016).

Scientific programme

Mercury transit observed at the Hvar Observatory, 09.05.2016

Written by Jaša Čalogović Tuesday, 10 May 2016 00:00

thumb OH HA mercury transit 20160509 113034The transits of Mercury across the solar disk are rare phenomena, although Mercury orbits the Sun in just 88 days. The reason for this is that Mercury orbits the Sun with the certain angle to the ecliptic, ie. the plane that the Earth orbits the Sun. Mercury transit in Croatia was visible on 9 May 2016, started at 13:12h local time and could be seen for almost 7 hours. Unfortunately, end of transit was not visible from our region because the sunset was at 20:10h and end of transit was at 20:42h. This rare phenomena was possible to observe from Hvar, and it was recoreded in white light and H-alpha using Hvar solar telescope. The next transit of Mercury will be visible from the Croatia in 2019.

Read more: Mercury transit observed at the Hvar Observatory, 09.05.2016


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  • Solar Activity Level: LOW
    Solar Activitly level is LOW.

    2-day Flare Index (entire sun): 6.7
    X-Class Flares: 0
    M-Class Flares: 0
    C-Class Flares: 5
  • Most Active Region: NOAA 12529
    The Most Active Region is NOAA 12529.

    2-day Flare Index: 3.9
    X-Class Flares: 0
    M-Class Flares: 0
    C-Class Flares: 3

    Region Statistics for Today
    Mount Wilson Class: b
    Area: 0850
    Nummber of Spots: 19
    Flares: C1.8 (07:40)

    Region Statistics for Yesterday
    Mount Wilson Class: b
    Area: 0820
    Nummber of Spots: 16
    Flares: C1.1 (01:36) C1.0 (18:28)


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