Influence of the solar wind high-speed streams on the thermospheric neutral density during the declining phase of solar cycle 23

Giuliana Verbanac, Mario Bandic*, Sandro Krauß

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Thermospheric neutral density derived from the GRACE A satellite and normalized at altitude of 490 km (ρ) are used to investigate the ρ behavior during the period of recurrent geomagnetic activity (25 January - 5 May, 2005) caused by solar wind high-speed streams (HSSs). The north and south hemispheric ρ values divided in three latitudinal bins are analyzed separately at dayside and nightside. The variations, not caused by solar/geomagnetic activity, are investigated accounting for the relationship between solar flux index, illumination, latitude and DOY for particular magnetic local times (MLTs). Analysis has shown that: ρ increases/decreases from high to low latitudes at dayside/nightside; ρ increases from high to low latitudes at dayside caused by solar EUV radiation is most prominent around MLT = 14 and decrease rapidly with departure from this MLT; the difference between north and south hemispheric ρ values are not the same prior and after the equinox; quiet time ρ differs among latitudinal bins; ρ contains a clear imprint of solar/geomagnetic activity. The cross-correlation analysis reveals a high degree of correlation between ρ and different employed ρ indicators. Time lags based on all ρ indicators suggest that ρ disturbance: occurs about 4 h earlier at high than at lower latitudes and propagates presumably without losses toward equatorial region both at dayside and nightside; propagates faster between polar and mid latitudes at dayside and between mid and low latitudes at nightside. This study provides the most probable characteristics of the ρ variations during the periods in which magnetospheric-thermospheric system is affected primarily by HSSs.

Original languageEnglish
Pages (from-to)4335-4350
Number of pages16
JournalAdvances in Space Research
Volume69
Issue number12
DOIs
Publication statusPublished - 15 Jun 2022

Keywords

  • Geomagnetic activity
  • High speed solar wind streams
  • Thermospheric neutral density

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Aerospace Engineering
  • Geophysics
  • Earth and Planetary Sciences(all)
  • Space and Planetary Science
  • Atmospheric Science

Fingerprint

Dive into the research topics of 'Influence of the solar wind high-speed streams on the thermospheric neutral density during the declining phase of solar cycle 23'. Together they form a unique fingerprint.

Cite this