Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.621 IF 1.621
  • IF 5-year value: 1.614 IF 5-year
    1.614
  • CiteScore value: 1.61 CiteScore
    1.61
  • SNIP value: 0.900 SNIP 0.900
  • SJR value: 0.910 SJR 0.910
  • IPP value: 1.58 IPP 1.58
  • h5-index value: 24 h5-index 24
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 80 Scimago H
    index 80
Discussion papers
https://doi.org/10.5194/angeo-2018-98
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2018-98
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 06 Sep 2018

Regular paper | 06 Sep 2018

Review status
This discussion paper is a preprint. It has been under review for the journal Annales Geophysicae (ANGEO). The manuscript was not accepted for further review after discussion.

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

Facundo L. Poblet and Francisco Azpilicueta Facundo L. Poblet and Francisco Azpilicueta
  • Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, La Plata, 1900, Argentina

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.

Facundo L. Poblet and Francisco Azpilicueta
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Facundo L. Poblet and Francisco Azpilicueta
Facundo L. Poblet and Francisco Azpilicueta
Viewed  
Total article views: 418 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
338 76 4 418 4 3
  • HTML: 338
  • PDF: 76
  • XML: 4
  • Total: 418
  • BibTeX: 4
  • EndNote: 3
Views and downloads (calculated since 06 Sep 2018)
Cumulative views and downloads (calculated since 06 Sep 2018)
Viewed (geographical distribution)  
Total article views: 409 (including HTML, PDF, and XML) Thereof 407 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 22 Mar 2019
Publications Copernicus
Download
Short summary
In this article, the Semiannual Variation is recognized in electron fluxes of the outer radiation belt using Van Allen Probes data. The maxima near the equinoxes are clearly seen but the the maximum of the March equinox appears delayed one month from the theories prediction. Also, the Semiannual Variation is detected only in a narrow energy range: electron fluxes with energies between the MeV to tens MeV.
In this article, the Semiannual Variation is recognized in electron fluxes of the outer...
Citation