Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations

Abstract. The Semiannual Variation (SAV) is an annual pattern characterized by maxima around the equinoxes and minima near solstices observed in many space weather parameters. Several authors have studied this variation in the electron fluxes of the magnetosphere, focusing only in a few energy level...

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Detalles Bibliográficos
Autores principales: Poblet, Facundo Leandro, Azpilicueta, Francisco Javier
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Astronómicas
Ciencias Exactas
Semiannual variation
Electron fluxes
Equinox
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124035
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124035
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Ciencias Exactas
Semiannual variation
Electron fluxes
Equinox
spellingShingle Ciencias Astronómicas
Ciencias Exactas
Semiannual variation
Electron fluxes
Equinox
Poblet, Facundo Leandro
Azpilicueta, Francisco Javier
Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
topic_facet Ciencias Astronómicas
Ciencias Exactas
Semiannual variation
Electron fluxes
Equinox
description Abstract. The Semiannual Variation (SAV) is an annual pattern characterized by maxima around the equinoxes and minima near solstices observed in many space weather parameters. Several authors have studied this variation in the electron fluxes of the magnetosphere, focusing only in a few energy levels. In this investigation, Van Allen probes data are processed to extend SAV studies in electron fluxes of a wider energy range. A superposed epoch analysis was applied to data of the REPT and MagEIS instruments obtaining a clear semiannual pattern in the superposed year for L-shell values between 2.5 and 6.5. The Day Of Year (DOY) at which the highest electron flux values are detected near the September equinox coincide with the Russel & McPherron prediction. However, the DOY of the maximum expected close the March equinox occurs with a one month lag from the prediction of the accepted models. In addition, integrating over L-shell the annual DOY-L data with the semiannual pattern resulted in temporal curves that enabled to determine the energy range for which the SAV can be detected: from MeV to tens MeV energy values. Finally, an additional analysis of the fluxes of the Ring Current principal components (H+ and O+ ions) was performed, obtaining no evidence of a SAV on them. This result could indicate that the widely recognized semiannual pattern in the geomagnetic activity is related to a different current system.
format Articulo
Preprint
author Poblet, Facundo Leandro
Azpilicueta, Francisco Javier
author_facet Poblet, Facundo Leandro
Azpilicueta, Francisco Javier
author_sort Poblet, Facundo Leandro
title Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
title_short Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
title_full Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
title_fullStr Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
title_full_unstemmed Semiannual Variation in radiation belts particle fluxes : Van Allen probes observations
title_sort semiannual variation in radiation belts particle fluxes : van allen probes observations
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/124035
work_keys_str_mv AT pobletfacundoleandro semiannualvariationinradiationbeltsparticlefluxesvanallenprobesobservations
AT azpilicuetafranciscojavier semiannualvariationinradiationbeltsparticlefluxesvanallenprobesobservations
bdutipo_str Repositorios
_version_ 1764820450703048704

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