NEWS


JÁN RYBÁK

Astronomical Institute, Slovak Academy of Sciences
SK-059 60 Tatranská Lomnica, Slovakia
email: choc astro sk, WWW: http://www.astro.sk/~choc


  • [NEW] August 10, 2024: During the Open Doors Day at the Lomnicky Stit Observatory my colleagues and I were guiding visitors to the LSO dome.

  • [NEW] July 28, 2024: The Astronomical Institute of Slovak Academy of Sciences in Tatranska Lomnica (Slovakia) is organizing in summer this year for the first time Lomnicky Stit Observatory Summer Internship Program for university students of astronomy, astrophysics (and physics). I am a responsible person for this program.

  • November 08, 2023: This year I took part at the Science and Technology Week in the Slovak Republic having an oral presentation "Research of the Sun at the Lomnicky Stit Observatory" in the headquarters building of AISAS.

  • February 9, 2023: An article "Multi-Periodicity of High-Frequency Type III Bursts as a Signature of the Fragmented Magnetic Reconnection", I am a co-author of, has been accepted for publication in the journal Universe. The article is available at article page.

  • September 8, 2022: In frame of SOLARNET Summer School 'Solar corona - complex research from ground-based and space' I have presented to the students and the lectures of the school basic information on the LSO and practice of the g-b coronagraphic observations of the Sun Practice at the LSO (in 30 minutes...) - PDF).

  • August 02, 2022: Student Mark Morris (Westminster School, London) join me for more than a week during my duty at the Lomnicky Stit Observatory for the summer internship working on the more precise determination of the polar branches of prominences from the LSO/KSO prom catalogue and searching for a relation of these branches to the time-latitude distribution of the solar surface magnetic flux.

  • July 29, 2022: Accidentally, two my PR outputs were released in one day... The interview of Martin Mojžiš with me in the .týždeň journal about the Sun "Škvrny a erupcie" and the article of Veronika Michalčíková in the newspaper Korzár about work and life at the LSO "Za búrky odpájajú káble, budia sa s východom slnka. Ako pracujú vedci na Lomničáku".

  • April 13, 2022: An article "Narrowband spikes observed during the 13 June 2012 flare in the 800-2000 MHz range", I am a co-author of, has been accepted for publication in the Solar Physics. The article is available at the Solar Physics journal article page at article page at ArXiv.

  • November 11, 2021: This year I took part at the Science and Technology Week in the Slovak Republic having an online presentation and discussion on "Research of the Sun at the Lomnicky Stit Observatory" using the ZOOM teleconf tool.

  • August, 15, and September, 27, 2021: Articles "The SLED project and the dynamics of coronal flux ropes" and "The Solar Line Emission Dopplerometer project", I am a co-author of, have been accepted for publication in journals Advances in Space Research and Experimental Astronomy respectively. The articles are available at these two ArXiv webpages - article page and article page.

  • August, 1, 2021: A log-term technical maintenance period of the The Lomnicky Stit Observatory has been finished and regular observation have begun again.

  • February, 11, 2021: An article "Narrowband Spikes Observed During the November 7, 2013 Flare", I am a co-author of, has been accepted for publication in the Astrophysical Journal. The article is available at the ApJ journal article page and at article page at ArXiv.

  • November 18, 2020: An article "Electron Densities in the Solar Corona Measured Simultaneously in the Extreme-Ultraviolet and Infra-Red", I am a co-author of, has been accepted for publication in the Astrophysical Journal. The article is available at the moment at ArXiv. and at the ApJ journal article page.

  • November 12, 2020: This year I took part at the Science and Technology Week in the Slovak Republic having an online presentation and discussion on "Research of the Sun at the Lomnicky Stit Observatory" using the ZOOM teleconf tool.

  • October 1, 2020: An article "The 2017 September 6 Flare: Radio Bursts and Pulsations in the 22-5000 MHz Range and Associated Phenomena", I am a co-author of, has been accepted for publication in the Astrophysical Journal Supplement Series. The article is available at ArXiv and at the ApJS journal article page. These results have been highlighted also in the CESRA Radio Solar Science Highlights on Nov 17, 2020 under the title Radio bursts in the 2017 September 6, X9.3 flare.

  • January 28, 2020: An article, I am a co-author of, has been published this month: 'Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare' of authors Karlicky, Chen, Gary, Kasparova, and Rybak (The Astrophysical Journal, vol.889, No.2, p. 72, 2020). The article is available at ArXiv.

  • September 13, 2019: Winners of the student project competition of the ESA supported project SPACE:LAB at the LSO including a lecture in our dome as a price.

  • July 26, 2019: An article What it’s like to work at the highest workplace in Slovakia of the journalist J. Liptakova about work on the Lomnicky Peak Obsevatory of AISAS has appeared in the web version of the journal The Slovak Spectator. I was the guide responsible for her visit of the LSO, so my name is frequently mentioned through the article text.

  • May 6, 2019: Three posters, I am a co-author of, will be presented at 'Advances in Solar and Heliospheric Physics' - 2nd China-Europe Solar Physics Meeting (CESPM 2019) (Hvar, Croatia, 04-10/05/2019). All contributions utilize observations aquired at the Lomnicky Stit Observatory.

  • March 12, 2019: An article, I am a co-author of, has been published this month: 'Automatic detection and tracking of coronal bright points in SDO/AIA images' of authors Dorotovic, Coelho, Rybak, Mora, Ribeiro, Kusa, and Pires in the "Sun and Geosphere" journal (S&G, vol.13, No.2, p. 129, 2018).

  • October 20, 2018: Two articles, I am a co-author of, have been published this month. The article 'Fourier Power Spectra of Solar Noise Storms' of authors Karlicky, Rybak, and Monstein in the Solar Physics journal and the article 'Gradient Path Labelling method and tracking method for calculation of solar differential rotation using coronal bright points' of Dorotovic, Coelho, Rybak, Mora, and Ribeiro in the Astronomy & Computing.

  • August 3, 2018: Our summer research student Alessandro Liberatore (INAF/AOT,Torino, Italy) has finished his ERASMUS-based stay at the LSO devoted to his first steps in the actual ground-based coronagraphic observations.

  • March 13, 2018: An article 'Oscillations and Waves in Radio Source of Drifting Pulsation Structures' of authors Karlicky, Rybak, and Barta has been accepted for publication in Solar Physics journal and on March 19, 2018 posted at ArXiv. The final reference is Solar Physics 293:62 (2018), DOI: https://doi.org/10.1007/s11207-018-1282-9. The article is available at the journal web page.

  • January 15, 2018: I have been appointed to a position of a head of the Lomnicky Stit Observatory of AISAS.

  • September 20, 2017: Based on an AISAS internal call I have applied for position of the head of the Solar Physics Department of AISAS: the department conception document, the complete application document (both in Slovak).

  • September 11, 2017: Attending the ESPM15 meeting help in Budapest (Hungary, September 4-8, 2017) I have presented, on behalf of a large group of co-authors, the poster entitled 'Cold plasma rotation in the tornado-like prominence of July 13, 2014: a real motion or an illusive effect?' (PDF file) being also co-author of 5 other posters presented by my colleagues I. Dorotovic, J. Koza, H. Meszaroszova, and P. Schwartz.

  • July 31, 2017: An article 'Spectroscopic inversions of the Ca II 8542 A line in a C-class solar flare' of authors D. Kuridze, V. Henriques, M. Mathioudakis, J. Koza, T. V. Zaqarashvili, A. Hanslmeier, F. P. Keenan, and myself has been accepted for publication in The Astrophysical Journal and on Aug 3, 2017 posted at ArXiv. The article is available at the ApJ page.

  • July 24, 2017: An article 'Spectral Characteristics of the He I D3 Line in a Quiescent Prominence Observed by THEMIS' of authors J. Koza, P. Gomory, M. Kozak (AISAS, Tatranska Lomnica), A. Lopez Ariste (UPS-OMP, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, and Institut de Recherche en Astrophysique et Planétologie, CNRS, Toulouse, France) and myself has been posted on-line in the Solar Physics journal (Solar Physics 292, article id.#98 (2017)

  • May 24, 2017: An article 'Oscillations in the 45-5000 MHz Radio Spectrum of the 18 April 2014 Flare' of authors M. Karlicky (AI CAS, Ondrejov, Czech republic), C. Monstein (Institute for Astronomy, ETH, Zurich, Switzerland) and myself has been accepted for publication in the Solar Physics journal (Solar Physics 292, article id.#94 (2017), article at ArXiv).

  • March 23, 2017 : The CoMP-S@LSO data reduction pipeline has been extended for a new sky scattered light background subtraction algorithm. The algorithm takes care for actual scattering conditions during individual frame acqusitions. Examples of the Gaussian fitting parameters derived from the data with the sky scattered light background subtracted before the fitting action can be seen below:


    The Gaussian fitting parameters of the H I 656 nm line

  • November 18, 2016: The preliminary version of the CoMP@MLSO Fe XIII 1074/1079 line ratio "pseudomaps" has been derived for the co-temporal and co-spatial EIS/Hinode rasters acquired on 2016/08/21. The data were recorded during the coordinated observational programme IHOP 316 'Searching for Non-Maxwellian Distributions with COMP, EIS, and IRIS', led by Jaro Dudik (AI CAS, Ondrejov, Czech republic). This programme wass scheduled as a ToO project in August and September 2016. Examples of the CoMP@MLSO Fe XIII 1074/1079 line ratio "pseudomaps" simultaneous with the EIS/Hinode raster (2016/08/21, 20:13:09-21:34:24) can be seen below:


    The line ratio "pseudomap" without any
    CoMP@MLSO pointing corrections applied.


    The line ratio "pseudomap" with a simple
    CoMP@MLSO pointing corrections applied.

  • November 05, 2016: An article 'Oscillation maps in the broadband radio spectrum of the 1 August 2010 event' of authors M. Karlicky (AI CAS, Ondrejov, Czech republic) and myself has been accepted fo publication in the Solar Physics journal. The article is available at arXiv.

  • October 11, 2016: An actual list of observations (HTML, PDF, XLS - up to MS Excel 2003 or LibreOffice 4.2.8.2), performed by the CoMP-S instrument, at the Lomnicky Peak Observatory, for the OBS_PROG 002 has been discussed with the program proposers A. Veronig and M. Temmer (IGAM/Institufe for physics, KF Uvibersity, Graz, Austria) and the next few steps of the TODO list have been set.

  • September 28, 2016: 'Broadband microwave sub-second pulsations in an expanding coronal loop of the 2011 August 10 flare' - a paper of H. Meszarosova, J. Rybak, L. Kashapova, P. Gomory and S. Tokhchukova, has appeared in the Astronomy & Astrophysics journal, volume 593, A80 (2016): A&A article page, PDF full paper file, ArXiv article page.

  • August 23, 2016: The CoMP-S@LSO data of the observing campaign 'Spectropolarimetry of the quiet prominences and their cavities' of P. Schwartz has been reduced and data were provided for an analysis of the He I 656 nm and Ca II 854 nm lines. In total data of 4 observing days are prepared with several promimences observed each day. Examples of the Gaussian fitting parameters can be seen below:


    The Gaussian fitting parameters of the H I 656 nm line


    The uncertainties of determination of the Gaussian fitting parameters of the H I 656 nm line

  • August 21, 2016: Actually performed coordinated observational programme IHOP 316 'Searching for Non-Maxwellian Distributions with COMP, EIS, and IRIS', led by Jaro Dudik (AI CAS, Ondrejov, Czech republic), has got coordinated observations of the EIS/Hinode, IRIS and CoMP@MLSO instruments for the first time. This programme is scheduled as a ToO project till end of September 2016. Programme LOG file summarizes observationall efforts of the instruments and data acquired.

  • May 11-19, 2016: 'Waves in fine-scale structures of the solar chromosphere' - a joint observing campaign for detailed study of waves in chromospheric fine-scale structures combining high resolution imaging spectroscopy in the H I 656 and nm Ca II 854 nm spectral lines obtained by the instrument CRISP at the Swedish 1-m Solar Telescope (SST) with the UV/EUV data obtained simultaneously by the cosmic solar observatories IRIS and SDO (PI: Julius Koza). I have been involved in the performace of the CRISP@SST observations and I am also working on the post-facto data reduction and coaligment. Web page of the campaign can be found at the dedicated web page with lot of LOG files in text and pictures.

    Last update: JR, 20/09/2017