Day-to-day variability and solar preconditioning of thermospheric temperature over Millstone Hill

Shun Rong Zhang, John M. Holt, Philip J. Erickson, Larisa P. Goncharenko

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Abstract

We use a continuous 30-day incoherent scatter radar experiment at Millstone Hill in October 2002 to examine day-to-day thermospheric variability in exospheric temperature Tex. Solar flux and magnetic activity influences as the main driving factors for day-to-day variability are investigated quantitatively. Solar ultraviolet flux levels are based on the TIMED/SEE space weather product, allowing for analysis of ultraviolet flux-Tex correlation. Tex is most sensitive to solar EUV flux with approximately a 2-day delay at wavelengths of 27-34-nm (including 30.4-nm). In particularly, a 20-60-h time delay occurs in Tex response to EUV flux at 27-34-nm band, with shorter delays in the morning and longer delays in the afternoon and at night. The 1-∼-2-day delayed Tex response to solar ultraviolet flux and associated thermospheric solar preconditioning ("memory") are most significant in the daily mean for the 27-34-nm band, in the diurnal and semidiurnal amplitudes for the soft X-ray flux at 0.1-7-nm, and in the diurnal amplitude for longer wavelengths. An empirical model driven only by EUV flux at 27-34-nm from 2-days in advance reproduces 90% of the observed variability in the Tex daily mean. With a 2-day time delay, solar X-ray flux at 0.1-7-nm is correlated positively with Tex diurnal amplitude and negatively with Tex semidiurnal amplitude. Finally, magnetic activity control, as represented by the Dst index, is weaker during the day and stronger at night and is important for the semidiurnal amplitude but not important for the daily mean. Key Points Correlation analysis between exospheric temperature and EUV at different bands A 20-60 h time delay in exospheric temperature response to EUV flux EUV-only model at 27-34-nm for 2-days in advance produces 90% of DC variability

Original languageEnglish
Pages (from-to)3913-3927
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number5
DOIs
Publication statusPublished - May 1 2015

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preconditioning
Fluxes
wavelengths
temperature
X-radiation
solar flux
Temperature
time lag
radar
wavelength
Time delay
night
weather
programming environments
incoherent scatter radar
space weather
morning
daytime
X rays
Wavelength

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Day-to-day variability and solar preconditioning of thermospheric temperature over Millstone Hill. / Zhang, Shun Rong; Holt, John M.; Erickson, Philip J.; Goncharenko, Larisa P.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 5, 01.05.2015, p. 3913-3927.

Research output: Contribution to journalArticle

Zhang, Shun Rong ; Holt, John M. ; Erickson, Philip J. ; Goncharenko, Larisa P. / Day-to-day variability and solar preconditioning of thermospheric temperature over Millstone Hill. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 5. pp. 3913-3927.
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