Confirming geomagnetic Sfe by means of a solar flare detector based on GNSS
| Autor: | José Miguel Juan, Cristhian Camilo Timoté, Juan José Curto |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Ciència i Tecnologia Aeroespacials, Universitat Politècnica de Catalunya. gAGE - Grup d'Astronomia i Geomàtica |
| Jazyk: | angličtina |
| Předmět: |
Atmospheric Science
gnss-sf Rise time 010504 meteorology & atmospheric sciences solar flares Astrophysics lcsh:QC851-999 01 natural sciences GNSS-SF Physics::Geophysics Background noise Acceleration Sistema de posicionament global Solar flareS Ionization Global Positioning System 0103 physical sciences Ionosphere sfe detection rise time 010303 astronomy & astrophysics 0105 earth and related environmental sciences Sfe detection Physics Solar flare Ionosfera Ionospheric disturbances Detector Earth's magnetic field 13. Climate action Space and Planetary Science GNSS applications Physics::Space Physics lcsh:Meteorology. Climatology ionospheric disturbances Matemàtiques i estadística::Impacte ambiental [Àrees temàtiques de la UPC] |
| Zdroj: | Journal of Space Weather and Space Climate, Vol 9, p A42 (2019) UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname Journal of Space Weather and Space Climate |
| ISSN: | 2115-7251 |
| DOI: | 10.1051/swsc/2019040 |
| Popis: | Solar Flares (SF) refer to sudden increases of electromagnetic radiation from the Sun lasting from minutes to hours. Irradiance in the Extremely Ultra-Violet (EUV) or X band is enhanced and it can produce a sudden over-ionization in the ionosphere, which can be tracked by several techniques. On the one hand, this over-ionization increases the ionospheric delays of GNSS signals in such a way as can be monitored using measurements collected by dual-frequency GNSS receivers. On the other hand, this over-ionization of the ionosphere is the origin of electrical currents which, in turn, induce magnetic fields which can be monitored with ground magnetometers. In this work we propose the use of a GNSS Solar Flare Monitor (GNSS-SF) for its utility to confirm the presence of ionospheric ionization which is able to produce Solar Flare Effects (Sfe) in geomagnetism. A period of 11 years (2008–2018) has been analyzed and contingency tables are shown. Although most of the GNSS-SF detections coincide with SF and most of the Sfe have a detected origin in the ionosphere, there are some paradoxes: sometimes small flares produce disturbances which are clearly detected by both methods while other disturbances, originated by powerful flares, go by virtually unnoticed. We analyzed some of these cases and proposed some explanations. We found that suddenness in the variation is a key factor for detection. Threshold values of the velocity of change to remove the background noise and the use of the acceleration of change instead of the velocity of change as the key performance detector are other topics we deal with in this paper. We conclude that the GNSS-SF detector could provide warnings of ionization disturbances from SF covering the time when the Sfe detectors are “blind”, and can help to confirm Sfe events when Sfe detectors are not able to give a categorical answer. |
| Databáze: | OpenAIRE |
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