1. Solar radio emission as a disturbance of aeronautical radionavigation
- Author
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Karl-Ludwig Klein, Antti Pulkkinen, Christian Monstein, Peter Thulesen, Rudiger Van Hoof, Hermann Opgenoorth, Stephan Buchert, Christophe Marqué, Säm Krucker, Royal Observatory of Belgium [Brussels], Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology in Zürich [Zürich] (ETH Zürich), Swedish Institute of Space Physics [Uppsala] (IRF), NASA Goddard Space Flight Center (GSFC), Fachhochschule Nordwestschweiz [Windisch] (FHNW), ANR-14-ASTR-0027,ORME,Outils radio astronomiques pour la météorologie de l'espace(2014), Royal Observatory of Belgium [Brussels] (ROB), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), and Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich) more...
- Subjects
Sun: flares ,Atmospheric Science ,radio radiation ,Sun: solar-terrestrial relations [Sun] ,010504 meteorology & atmospheric sciences ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,Astrophysics::High Energy Astrophysical Phenomena ,solar-terrestrial relations [Sun] ,FOS: Physical sciences ,Astrophysics ,Space weather ,lcsh:QC851-999 ,GPS signals ,01 natural sciences ,Radio spectrum ,law.invention ,Astronomi, astrofysik och kosmologi ,law ,0103 physical sciences ,Astronomy, Astrophysics and Cosmology ,Radar ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,0105 earth and related environmental sciences ,Physics ,[PHYS]Physics [physics] ,Solar flare ,Sun: radio radiation ,radio radiation [Sun] ,Radio navigation ,[PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph] ,flares [Sun] ,Ultra high frequency ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Sun: solar-terrestrial relations ,lcsh:Meteorology. Climatology ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Flare - Abstract
On November 4th 2015 secondary air traffic control radar was strongly disturbed in Sweden and some other European countries. The disturbances occurred when the radar antennas were pointing at the Sun. In this paper, we show that the disturbances coincided with the time of peaks of an exceptionally strong ($\sim 10^5$ Solar Flux Units) solar radio burst in a relatively narrow frequency range around 1~GHz. This indicates that this radio burst is the most probable space weather candidate for explaining the radar disturbances. The dynamic radio spectrum shows that the high flux densities are not due to synchrotron emission of energetic electrons, but to coherent emission processes, which produce a large variety of rapidly varying short bursts (such as pulsations, fiber bursts, and zebra patterns). The radio burst occurs outside the impulsive phase of the associated flare, about 30 minutes after the soft X-ray peak, and it is temporarily associated with fast evolving activity occurring in strong solar magnetic fields. While the relationship with strong magnetic fields and the coherent spectral nature of the radio burst provide hints towards the physical processes which generate such disturbances, we have so far no means to forecast them. Well-calibrated monitoring instruments of whole Sun radio fluxes covering the UHF band could at least provide a real-time identification of the origin of such disturbances, which reports in the literature show to also affect GPS signal reception., Accepted for publication in the Journal of Space Weather and Space Climate (JSWSC), 20 pages, 7 figures more...
- Published
- 2018
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