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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 4
Ann. Geophys., 20, 539–545, 2002
https://doi.org/10.5194/angeo-20-539-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 539–545, 2002
https://doi.org/10.5194/angeo-20-539-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Apr 2002

30 Apr 2002

Are variations in PMSE intensity affected by energetic particle precipitation?

V. Barabash1, S. Kirkwood1, and P. B. Chilson2 V. Barabash et al.
  • 1Swedish Institute of Space Physics, Box 812, S-981-28 Kiruna, Sweden
  • 2NOAA Environmental Technology Laboratory and Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado-NOAA, 325 Broadway, R/ET2, Boulder, CO 80305-3328, USA
  • Correspondence to: S. Kirkwood (sheila.kirkwood@irf.se)

Abstract. The correlation between variations in Polar Mesosphere Summer Echoes (PMSE) and variations in energetic particle precipitation is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 67°53' N, 21°06' E. The 30 MHz riometer in Abisko (68°24' N, 18°54' E) registered radio wave absorption caused by ionization changes in response to energetic particle precipitation. The relationship between the linear PMSE intensity and the square of absorption has been estimated using the Pearson linear correlation and the Spearman rank correlation. The mean diurnal variation of the square of absorption and the linear PMSE intensity are highly correlated. However, their day-to-day variations show significant correlation only during the late evening hours. The correlation in late evening does not exceed 0.6. This indicates that varying ionization cannot be considered as a primary source of varying PMSE, and the high correlation found when mean diurnal variations are compared is likely a by-product of daily variations caused by other factors.

Key words. Ionosphere (particle precipitation) Magnetospheric physics (energetic particles, precipitating) Meteorology and atmospheric dynamics (precipitation)

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