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Solar radio emission as a disturbance of aeronautical radionavigation View all abstracts by submitter

Karl-Ludwig Klein   Submitted: 2018-08-22 04:31

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 (~105 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.

Authors: Christophe Marqué, Karl-Ludwig Klein, Christian Monstein, Hermann Opgenoorth, Antti Pulkkinen, Stephan Buchert, Säm Krucker, Rudiger Van Hoof, Peter Thulesen
Projects: None

Publication Status: accepted for pubication in Journal of Space Weather and Space Climate
Last Modified: 2018-08-22 12:07
Go to main E-Print page  Implications of loop-top origin for microwave, hard X-ray, and low-energy gamma-ray emissions from behind the limb flares   A Diagnostic of Coronal Elemental Behavior during the Inverse FIP Effect in Solar Flares  Edit Entry  Download Preprint  Delete Entry 

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