TY - JOUR AU - Demirhan, K. AU - Mrdja, D. AU - Hegedüs, Tibor AU - Forkapic, S. AU - Hansman, J. AU - Velimirovic, D. AU - Knezevic, Radic J. AU - Cujic, M. TI - Observations of anomalous peaks in atmospheric ionizing radiation below 10 km JF - ADVANCES IN SPACE RESEARCH J2 - ADV SPACE RES VL - 75 PY - 2025 IS - 11 SP - 7787 EP - 7799 PG - 13 SN - 0273-1177 DO - 10.1016/j.asr.2025.03.015 UR - https://m2.mtmt.hu/api/publication/36164134 ID - 36164134 N1 - University of Novi Sad, Faculty of Sciences, Department of Physics, Novi Sad, 21000, Serbia Baja Observatory of the University of Szeged, Szegedi ut KT 766, Baja, 6500, Hungary University of Belgrade, Vinča Institute of Nuclear Sciences, Vinča, Belgrade, 11351, Serbia Export Date: 27 May 2025; Cited By: 0; Correspondence Address: K. Demirhan; University of Novi Sad, Faculty of Sciences, Department of Physics, Novi Sad, Trg Dositeja Obradovica 4, 21000, Serbia; email: kristina.bikit@df.uns.ac.rs; CODEN: ASRSD AB - Scientists have performed different kind of measurements with various experimental setups for more than 100 years in order to explore in detail the atmospheric ionizing radiation (AIR) profile. The common feature of all previous AIR measurements is the presence of continuous intensity increase of ionizing components along the atmospheric vertical profiles up to the well-known Regener-Pfotzer (RP) maximum appearing between 16–25 km altitudes. In this study, measured vertical ionization profile showed a peaking in ionizing radiation intensity in the atmosphere registered below 10 km altitude, exceeding more than 20 times the values at these heights from previous measurements by meteorological balloons (or in any other way lifted detectors into the atmosphere). We confirmed these findings by three independent measurements performed by detectors equipped with ultra-thin mica windows. The registered peaking in ionizing radiation intensity was observed at altitude ranging from 5-8 km, in a very narrow altitude region (∼300 m). Furthermore, Monte Carlo simulations of propagation of cosmic rays through the atmosphere were performed, searching for possible increase in number of detected events at certain altitudes (10 km, 8 km, and 5 km) due to air-shower developments. Unlike our experimental results, the simulation results did not show an enhance in the number of cosmic ray-produced secondary particles at certain altitudes (5 km or 8 km) relative to the 10 km altitude. A form of anomaly in atmospheric ionizing radiation field at lower altitudes has been seen in ARMAS (Automated Radiation Measurements for Aerospace Safety) data and measurements performed by the National University Corporation, Fukushima University. The presented results in this study will have broad impact on the better understanding of the ionizing radiation production mechanism in the atmosphere, as well as on its dose consequences. © 2025 COSPAR LA - English DB - MTMT ER - TY - CHAP AU - Barta, Márton AU - Bór, József AU - Hegedüs, Tibor ED - Béla-Vass, Bálint TI - Zivatarokhoz köthető elektro-optikai jelenségek és megfigyelésük a világűrből T2 - Móra Akadémia Szakkollégiumi tanulmánykötet PB - Szegedi Tudományegyetem Móra Ferenc Szakkollégium CY - Szeged T3 - Szakkollégiumi Füzetek - Móra Akadémia, ISSN 2064-809X ; 14. PY - 2025 SP - 111 EP - 126 PG - 16 UR - https://m2.mtmt.hu/api/publication/36314319 ID - 36314319 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Vinkó, József AU - Bodola, Zsófia Réka AU - Gődény, Ákos AU - Csák, Szelina Fruzsina AU - Könyves-Tóth, Réka AU - Nagy, Andrea AU - Szalai, Tamás AU - Bánhidi, Dominik AU - Bíró, Imre Barna AU - Bódi, Attila AU - Bora, Zsófia AU - Csányi, István AU - Cseh, Borbála AU - Hegedüs, Tibor AU - Horti-Dávid, Ágoston AU - Joó, András Péter AU - Kalup, Csilla AU - Kriskovics, Levente AU - Mochnács, Erika AU - Pál, András AU - Regály, Zsolt AU - Seli, Bálint Attila AU - Sódor, Ádám AU - Szabó, Olivér Norton AU - Szakáts, Róbert AU - Székely, Péter AU - Varga, Vázsony AU - Vida, Krisztián TI - SN 2023ixf in M101: Physical Parameters from Bolometric Light Curve Modeling JF - ASTROPHYSICAL JOURNAL J2 - ASTROPHYS J VL - 993 PY - 2025 IS - 1 PG - 11 SN - 1538-4357 DO - 10.3847/1538-4357/ae0614 UR - https://m2.mtmt.hu/api/publication/36413344 ID - 36413344 AB - We present new photometric observations of the core-collapse supernova SN 2023ixf occurred in M101, taken with the RC 80 and BRC80 robotic telescopes in Hungary. The initial nickel mass from the late-phase bolometric light curve extending up to 400 days after explosion, is inferred as M Ni = 0.046 ± 0.007 M ⊙ . The comparison of the bolometric light curve with models from hydrodynamical simulations as well as semi-analytic radiative diffusion codes reveals a relatively low-mass ejecta of M ej ≲ 9 M ⊙ , contrary to SN 2017eaw, another H-rich core-collapse event, which had M ej ≳ 15 M ⊙ . LA - English DB - MTMT ER - TY - JOUR AU - Fortier, A. AU - Simon, A. E. AU - Broeg, C. AU - Olofsson, G. AU - Deline, A. AU - Wilson, T. G. AU - Maxted, P. F. L. AU - Brandeker, A. AU - Collier Cameron, A. AU - Beck, M. AU - Bekkelien, A. AU - Billot, N. AU - Bonfanti, A. AU - Bruno, G. AU - Cabrera, J. AU - Delrez, L. AU - Demory, B.-O. AU - Futyan, D. AU - Florén, H.-G. AU - Günther, M. N. AU - Heitzmann, A. AU - Hoyer, S. AU - Isaak, K. G. AU - Sousa, S. G. AU - Stalport, M. AU - Turin, A. AU - Verhoeve, P. AU - Akinsanmi, B. AU - Alibert, Y. AU - Alonso, R. AU - Bánhidi, Dominik AU - Bárczy, T. AU - Barrado, D. AU - Barros, S. C. C. AU - Baumjohann, W. AU - Baycroft, T. AU - Beck, T. AU - Benz, W. AU - Bíró, Imre Barna AU - Bódi, A. AU - Bonfils, X. AU - Borsato, L. AU - Charnoz, S. AU - Cseh, Borbála AU - Csizmadia, Sz. AU - Csányi, István AU - Cubillos, P. E. AU - Davies, M. B. AU - Davis, Y. T. AU - Deleuil, M. AU - Demangeon, O. D. S. AU - Derekas, Aliz AU - Dransfield, G. AU - Ducrot, E. AU - Ehrenreich, D. AU - Erikson, A. AU - Fariña, C. AU - Fossati, L. AU - Fridlund, M. AU - Gandolfi, D. AU - Garai, Zoltán AU - Garcia, L. AU - Gillon, M. AU - Gómez Maqueo Chew, Y. AU - Gómez-Muñoz, M. A. AU - Granata, V. AU - Güdel, M. AU - Guterman, P. AU - Hegedüs, Tibor AU - Helling, Ch. AU - Jehin, E. AU - Kalup, Csilla AU - Kilkenny, D. AU - Kiss, L. László AU - Kriskovics, Levente AU - Lam, K. W. F. AU - Laskar, J. AU - Lecavelier des Etangs, A. AU - Lendl, M. AU - Lopez Pina, A. AU - Luntzer, A. AU - Magrin, D. AU - Miller, N. J. AU - Modrego Contreras, D. AU - Mordasini, C. AU - Munari, M. AU - Murray, C. A. AU - Nascimbeni, V. AU - Ottacher, H. AU - Ottensamer, R. AU - Pagano, I. AU - Pál, András AU - Pallé, E. AU - Pasetti, A. AU - Pedersen, P. P. AU - Peter, G. AU - Petrucci, R. AU - Piotto, G. AU - Pizarro-Rubio, A. AU - Pollacco, D. AU - Pribulla, T. AU - Queloz, D. AU - Ragazzoni, R. AU - Rando, N. AU - Rauer, H. AU - Ribas, I. AU - Sabin, L. AU - Santos, N. C. AU - Scandariato, G. AU - Schanche, N. AU - Schroffenegger, U. AU - Scutt, O. J. AU - Sebastian, D. AU - Ségransan, D. AU - Seli, Bálint Attila AU - Smith, A. M. S. AU - Southworth, R. AU - Standing, M. R. AU - Szabó M., Gyula AU - Szakáts, Róbert AU - Thomas, N. AU - Timmermans, M. AU - Triaud, A. H. M. J. AU - Udry, S. AU - Van Grootel, V. AU - Venturini, J. AU - Villaver, E. AU - Vinkó, József AU - Walton, N. A. AU - Wells, R. AU - Wolter, D. TI - CHEOPS in-flight performance: A comprehensive look at the first 3.5 yr of operations JF - ASTRONOMY & ASTROPHYSICS J2 - ASTRON ASTROPHYS VL - 687 PY - 2024 PG - 43 SN - 0004-6361 DO - 10.1051/0004-6361/202348576 UR - https://m2.mtmt.hu/api/publication/35150652 ID - 35150652 AB - Context . Since the discovery of the first exoplanet almost three decades ago, the number of known exoplanets has increased dramatically. By beginning of the 2000s it was clear that dedicated facilities to advance our studies in this field were needed. The CHaracterising ExOPlanet Satellite (CHEOPS) is a space telescope specifically designed to monitor transiting exoplanets orbiting bright stars. In September 2023, CHEOPS completed its nominal mission duration of 3.5 yr and remains in excellent operational conditions. As a testament to this, the mission has been extended until the end of 2026. LA - English DB - MTMT ER - TY - JOUR AU - Bora, Zsófia AU - Könyves-Tóth, Réka AU - Vinkó, József AU - Bánhidi, Dominik AU - Bíró, Imre Barna AU - Bostroem, K. Azalee AU - Bodi, Attila AU - Burke, Jamison AU - Csányi, István AU - Cseh, Borbála AU - Farah, Joseph AU - Filippenko, Alexei V. AU - Hegedüs, Tibor AU - Hiramatsu, Daichi AU - Horti-David, Agoston AU - Howell, D. Andrew AU - Jha, Saurabh W. AU - Kalup, Csilla AU - Krezinger, Máté AU - Kriskovics, Levente AU - McCully, Curtis AU - Newsome, Megan AU - Ordasi, Andras AU - Gonzalez, Estefania Padilla AU - Pál, András AU - Pellegrino, Craig AU - Seli, Bálint Attila AU - Sódor, Ádám AU - Szabo, Zsofia Marianna AU - Szabó, Olivér Norton AU - Szakáts, Róbert AU - Szalai, Tamás AU - Székely, Péter AU - Terreran, Giacomo AU - Varga, Vazsony AU - Vida, Krisztián AU - Wang, Xiaofeng AU - Wheeler, J. Craig TI - Ejecta Masses in Type Ia Supernovae—Implications for the Progenitor and the Explosion Scenario JF - PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC J2 - PUBL ASTRON SOC PAC VL - 136 PY - 2024 IS - 9 PG - 29 SN - 0004-6280 DO - 10.1088/1538-3873/ad6e18 UR - https://m2.mtmt.hu/api/publication/35298249 ID - 35298249 AB - The progenitor system(s) as well as the explosion mechanism(s) of thermonuclear (Type Ia) supernovae are long-standing issues in astrophysics. Here we present ejecta masses and other physical parameters for 28 recent Type Ia supernovae inferred from multiband photometric and optical spectroscopic data. Our results confirm that the majority of SNe Ia show {\\it observable} ejecta masses below the Chandrasekhar-limit (having a mean $M_{\\rm ej} \\approx 1.1 \\pm 0.3$ M$_\\odot$), consistent with the predictions of recent sub-M$_{\\rm Ch}$ explosion models. They are compatible with models assuming either single- or double-degenerate progenitor configurations. We also recover a sub-sample of supernovae within $1.2 $ M$_\\odot$ $< M_{\\rm {ej}} < 1.5$ M$_\\odot$ that are consistent with near-Chandrasekhar explosions. Taking into account the uncertainties of the inferred ejecta masses, about half of our SNe are compatible with both explosion models. We compare our results with those in previous studies, and discuss the caveats and concerns regarding the applied methodology. LA - English DB - MTMT ER - TY - JOUR AU - Zasche, P. AU - Borkovits, Tamás AU - Jayaraman, R. AU - Rappaport, S. A. AU - Brož, M. AU - Vokrouhlický, D. AU - Bíró, Imre Barna AU - Hegedüs, Tibor AU - Kiss, Z. T. AU - Uhlař, R. AU - Schwengeler, H. M. AU - Pál, András AU - Mašek, M. AU - Howell, S. B. AU - Dallaporta, S. AU - Munari, U. AU - Gagliano, R. AU - Jacobs, T. AU - Kristiansen, M. H. AU - LaCourse, D. AU - Omohundro, M. AU - Terentev, I. AU - Vanderburg, A. AU - Henzl, Z. AU - Powell, B. P. AU - Kostov, V. B. TI - V994 Herculis: a unique triply eclipsing sextuple star system JF - MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY J2 - MON NOT R ASTRON SOC VL - 520 PY - 2023 IS - 2 SP - 3127 EP - 3142 PG - 16 SN - 0035-8711 DO - 10.1093/mnras/stad328 UR - https://m2.mtmt.hu/api/publication/33720976 ID - 33720976 N1 - Funding Agency and Grant Number: NASA Science Mission Directorate; NASA [NAS5-26555]; NASA Office of Space Science [NNX09AF08G]; NASA Exoplanet Exploration Program; MEYS (Czech Republic) [LM2010105, LTT17006, EU/MEYS CZ.02.1.01/0.0/0.0/16 013/0001403, CZ.02.1.01/0.0/0.0/18 046/0016007]; Czech Science Foundation [GA21-11058S] Funding text: This paper includes data collected by the TESS mission, specifically as part of GI program G022062 (PI: A. Pr.sa). Funding for the TESS mission is provided by the NASA Science Mission Directorate. Resources used in this work were provided by the NASA High End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.; This research has made use of the Washington Double Star Catalog (WDS) maintained at the U.S. Naval Observatory, and we thank Rachel Matson for providing archival data on the V994 Her visual double.; This work has used data from the European Space Agency (ESA) mission Gaia,3 processed by the Gaia Data Processing and Analysis Consortium (DPAC).4 Funding for the DPAC is provided by national institutions, in particular those participating in the Gaia Multilateral Agreement.; Some of the observations in the paper made use of the High-Resolution Imaging instrument `Alopeke, obtained under Gemini LLP Proposal Number: GN/S-2021A-LP-105. `Alopeke was funded by the NASA Exoplanet Exploration Program and built at the NASA Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. `Alopeke was mounted on the Gemini North (and/or South) telescope of the International Gemini Observatory, a program of NSF's NOIR Lab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation, on behalf of the Gemini partnership: the National Science Foundation (USA), National Research Council Canada (Canada), Agencia Nacional de Investigacion y Desarrollo (Chile), Ministerio de Ciencia, Tecnologia e Innovacion (Argentina), Ministerio da Ciencia, Tecnologia, Inovacoes e Comunicacoes (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea).; This work is supported by MEYS (Czech Republic) under the projects MEYS LM2010105, LTT17006 and EU/MEYS CZ.02.1.01/0.0/0.0/16 013/0001403 and CZ.02.1.01/0.0/0.0/18 046/0016007.; MB and DV were supported by the Czech Science Foundation, grant GA21-11058S.; We also used the SIMBAD service operated by the Centre des Donnees Stellaires (Strasbourg, France) and the ESO Science Archive Facility services (data obtained under request number 396301). AB - We report the discovery with the Transiting Exoplanet Survey Satellite (TESS) of a third set of eclipses from V994 Herculis (V994 Her, TIC 424508303), previously only known as a doubly eclipsing system. The key implication of this discovery and our analyses is that V994 Her is the second fully characterized (2+2) + 2 sextuple system, in which all three binaries eclipse. In this work, we use a combination of ground-based observations and TESS data to analyse the eclipses of binaries A and B in order to update the parameters of the inner quadruple's orbit (with a derived period of 1062 ± 2 d). The eclipses of binary C that were detected in the TESS data were also found in older ground-based observations, as well as in more recently obtained observations. The eclipse timing variations of all three pairs were studied in order to detect the mutual perturbations of their constituent stars, as well as those of the inner pairs in the (2 + 2) core. At the longest periods they arise from apsidal motion, which may help constraining parameters of the component stars' internal structure. We also discuss the relative proximity of the periods of binaries A and B to a 3:2 mean motion resonance. This work represents a step forward in the development of techniques to better understand and characterize multiple star systems, especially those with multiple eclipsing components. LA - English DB - MTMT ER - TY - CONF AU - Barta, Márton AU - Bór, József AU - Hegedüs, Tibor TI - Zivatarokhoz köthető elektro-optikai jelenségek és megfigyelésük a világűrből T2 - VII. Móra Kárpát-medencei Interdiszciplináris Szakkollégiumi Konferencia PB - Szegedi Tudományegyetem Móra Ferenc Szakkollégium C1 - Szeged PY - 2023 UR - https://m2.mtmt.hu/api/publication/34574576 ID - 34574576 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Bór, József AU - Hegedüs, Tibor AU - Jäger, Zoltán AU - Molnár, Tibor AU - Molnár, Csaba AU - Szabó, Csongor AU - Szabóné André, Karolina AU - Zelkó, Zoltán AU - Döbrentei, László TI - Felsőlégköri elektro-optikai jelenségek távvezérelt észlelése Bajáról JF - Geofizikai Obszervatóriumi Közlemények J2 - Geofizikai Obszervatóriumi Közlemények VL - 2020 PY - 2022 SP - 37 EP - 53 PG - 17 SN - 2939-5054 DO - 10.55856/gok2020.5 UR - https://m2.mtmt.hu/api/publication/33559829 ID - 33559829 AB - A felsőlégkörben előforduló elektromos eredetű emissziók (FEOEM) optikai észlelése céljából egy távolról vezérelhető megfigyelőrendszert telepítettünk Baján 2014-ben. E jelentés tartalmazza a rendszert alkotó eszközök típusát, a valós idejű eseményészleléshez és rögzítéshez használt szoftverek leírását és beállításait, valamint ismertetjük a sikeres megfigyelésekhez alkalmazott eljárás menetét. Ezen kívül áttekintjük a 2020-ig rögzített észleléseket is. A hét év során 1648 FEOEM felvétel készült, amelyek 92.7%-a vörös lidérceket, 6.4%-a lidércudvart, összesen 3 felvétel pedig gyűrűlidércet tartalmaz. A legtöbb vörös lidércet júniusban észleltük, a lidércudvarok tekintetében pedig a szeptember volt némileg eseménydúsabb a vizsgált időszakban. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Bór, József AU - Hegedüs, Tibor AU - Jäger, Zoltán AU - Molnár, Tibor AU - Molnár, Csaba AU - Szabó, Csongor AU - Szabóné André, Karolina AU - Zelkó, Zoltán AU - Döbrentei, László TI - Remotely controlled observations of electro-optical upper atmospheric phenomena from Baja, Hungary JF - GEOPHYSICAL OBSERVATORY REPORTS OF THE INSTITUTE OF EARTH PHYSICS AND SPACE SCIENCE J2 - GOR VL - 2020 PY - 2021 SP - 51 EP - 65 PG - 15 SN - 0133-459X DO - 10.55855/gor2020.7 UR - https://m2.mtmt.hu/api/publication/32577387 ID - 32577387 AB - A remotely manageable optical observation system for recording transient luminous events (TLEs) in the upper atmosphere was installed in Baja, Hungary in 2014. This report describes hardware components and settings of the system, software solutions applied either for realtime event detection and remote control, and the strategy of actually making the observations. An overview on the number and type of TLEs observed up to 2020 is presented. During the 7 years of operation, 1655 TLEs were recorded, 92.7% of which were red sprites, 6.4% were sprite halos, and the set of captured events contained altogether only 3 ELVES. Most sprites were observed in June while most sprite halos were observed in September over the years covered in this report. LA - English DB - MTMT ER - TY - CHAP AU - Hegedüs, Tibor ED - Benkő, József TI - Égi kövek nyomában T2 - Meteor Csillagászati Évkönyv 2021 PB - Magyar Csillagászati Egyesület (MCSE) CY - Budapest SN - 2050000077685 PY - 2020 SP - 175 EP - 196 PG - 21 UR - https://m2.mtmt.hu/api/publication/31153092 ID - 31153092 AB - A meteoritok tüzetes vizsgálatából kiderülhet a törmelékanyag Naprendszer-beli előtörténete, sorsa. A cikk azt próbálja meg tisztázni, milyen feltételek mellett van esélye egy kis testnek, hogy a földfelszínre leérkezzen, ill. a kutatóknak milyen esélye lehet megtalálni ezeket? LA - Hungarian DB - MTMT ER -