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Variations of geomagnetic cutoff rigidity in the southern hemisphere close to 70°W (South-Atlantic Anomaly and Antarctic zones) in the period 1975–2010

dc.contributor.authorCordaro E.G.
dc.contributor.authorVenegas-Aravena P.
dc.contributor.authorLaroze D.
dc.date.accessioned2020-09-02T22:15:29Z
dc.date.available2020-09-02T22:15:29Z
dc.date.issued2019
dc.identifier10.1016/j.asr.2018.12.019
dc.identifier.citation63, 7, 2290-2299
dc.identifier.issn02731177
dc.identifier.urihttps://hdl.handle.net/20.500.12728/4074
dc.descriptionWe report the existence of rapid variations in (effective) geomagnetic cutoff rigidity (Rc) between the equatorial and Antarctic zones adjacent to the Andes Mountains, revealed by the variation rate of geomagnetic cutoff rigidity (VRc) in the period 1975–2010. Our analysis is based on empirical records and theoretical models of the variations in cosmic rays and on the structure of geomagnetic fields. These have given us a different view of variations in Rc in time and space along the 70°W meridian, where secular variations in the geomagnetic field are strongly influenced by the proximity of the South Atlantic Magnetic Anomaly (SAMA), one of the most important characteristics of the terrestrial magnetic field that affects our planet, close from the equator to the 50°S parallel and from South America to South Africa. The VRc presents rapid changes in mid-latitudes where SAMA exerts its influence despite the existence of smooth changes in the geomagnetic field. This shows that these changes occur mainly in the spatial configuration, rather than in the temporal evolution of Rc. The analysis was performed using measurements from the Chilean Network of Cosmic Rays and Geomagnetism Observatories, equipped with BF-3 and latest generation He-3 neutron monitors, Fluxgate magnetometers, geomagnetic reference field (IGRF) and Tsyganenko 2001 model (just for completeness). © 2018 COSPAR
dc.language.isoen
dc.publisherElsevier Ltd
dc.subjectAltiplano to Antarctica
dc.subjectGeomagnetic cutoff rigidity
dc.subjectGeomagnetic field
dc.subjectLatitudinal variation rate of geomagnetic cutoff rigidity
dc.subjectSouth Atlantic magnetic anomaly
dc.subjectCosmic ray measurement
dc.subjectCosmic rays
dc.subjectCosmology
dc.subjectMagnetometers
dc.subjectRigidity
dc.subjectAntarctica
dc.subjectCut-off rigidity
dc.subjectFluxgate magnetometer
dc.subjectGeomagnetic fields
dc.subjectSouth atlantic anomalies
dc.subjectSouth Atlantic magnetic anomaly
dc.subjectSpatial configuration
dc.subjectTerrestrial magnetic fields
dc.subjectGeomagnetism
dc.titleVariations of geomagnetic cutoff rigidity in the southern hemisphere close to 70°W (South-Atlantic Anomaly and Antarctic zones) in the period 1975–2010
dc.typeArticle


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