Model simulations of global change in the ionosphere

Liying Qian, Stanley C. Solomon, Raymond G. Roble, Timothy J. Kane

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Observations of secular trends in the E and F1 regions of the ionosphere indicate that electron densities have increased, and that the height of the E-region peak has decreased, during the past several decades. Detection of trends in the upper ionosphere through analysis of F2-layer parameters has been more complex and controversial. In order to facilitate observational detection of long-term trends in the ionosphere, simulations were performed using a single-column upper atmosphere model. CO2 concentrations for the year 2000 and projected for the year 2100 were used to investigate changes of electron densities and the altitudes of ionospheric layers. Results show that increased CO2 concentration increases electron density in the lower regions of the ionosphere, but decreases electron density in the upper ionosphere. The transition altitude occurs slightly below the F2 peak altitude (hmF2). The proximity of hmF2 to the transition altitude may explain why different analyses of long-term trends in F2 peak density have shown both positive and negative trends. The altitudes of the E, F1 and F2 regions all decrease with increased CO2 concentration.

Original languageEnglish (US)
Article numberL07811
JournalGeophysical Research Letters
Volume35
Issue number7
DOIs
StatePublished - Apr 16 2008

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global change
ionospheres
ionosphere
electron density
E region
trends
upper ionosphere
simulation
upper atmosphere
ionospherics
proximity
trend
detection
long-term trend

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Qian, Liying ; Solomon, Stanley C. ; Roble, Raymond G. ; Kane, Timothy J. / Model simulations of global change in the ionosphere. In: Geophysical Research Letters. 2008 ; Vol. 35, No. 7.
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Model simulations of global change in the ionosphere. / Qian, Liying; Solomon, Stanley C.; Roble, Raymond G.; Kane, Timothy J.

In: Geophysical Research Letters, Vol. 35, No. 7, L07811, 16.04.2008.

Research output: Contribution to journalArticle

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AU - Qian, Liying

AU - Solomon, Stanley C.

AU - Roble, Raymond G.

AU - Kane, Timothy J.

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AB - Observations of secular trends in the E and F1 regions of the ionosphere indicate that electron densities have increased, and that the height of the E-region peak has decreased, during the past several decades. Detection of trends in the upper ionosphere through analysis of F2-layer parameters has been more complex and controversial. In order to facilitate observational detection of long-term trends in the ionosphere, simulations were performed using a single-column upper atmosphere model. CO2 concentrations for the year 2000 and projected for the year 2100 were used to investigate changes of electron densities and the altitudes of ionospheric layers. Results show that increased CO2 concentration increases electron density in the lower regions of the ionosphere, but decreases electron density in the upper ionosphere. The transition altitude occurs slightly below the F2 peak altitude (hmF2). The proximity of hmF2 to the transition altitude may explain why different analyses of long-term trends in F2 peak density have shown both positive and negative trends. The altitudes of the E, F1 and F2 regions all decrease with increased CO2 concentration.

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