Time correlation of extreme ultraviolet radiation and thermospheric temperature

Bourdeau, R. E.; Chandra, Sushil; Neupert, W. M.

doi:10.1029/jz069i021p04531

Cited by 32 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…in previous studies (e.g., Eastes et al, 2004;Guo et al, 2007;Jacchia et al, 1973;Paul et al, 1974;Roemer, 1967), which implies that the peak response time of ρ is slightly longer than that of Tn (Bourdeau et al, 1964;Chandra & Krishnamurthy, 1968;Hedin, 1984;Jacchia et al, 1973;Priester, 1965;Roemer, 1968). Note that this study is devoted to investigating the physical mechanisms responsible for the delayed peak responses of thermospheric composition and density.…”

Section: Discussionmentioning

confidence: 77%

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

et al. 2020

View full text Add to dashboard Cite

Previous work suggested that the peak response time of the mass densities of atomic oxygen (O) and molecular nitrogen (N2) in the thermosphere had more than a 1‐day difference relative to the peak of the 27‐day periodic variation of solar extreme ultraviolet (EUV) flux. In this study, we used the Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM) to explore the physical mechanisms responsible for the different peak response times of the daytime thermospheric neutral species. It was found that the peak response time of O or N2 mass density corresponds to the time of equilibrium between the contributions from the barometric effect and the change in its abundance. The peak response time of O is shorter than that of thermospheric temperature Tn, due to a dynamic change in the circulation that acts to cancel out the contribution from the barometric process prior to the peak of Tn. On the contrary, the change of N2 abundance contributes further to a decrease of N2 mass density on a constant pressure surface when the thermosphere is expanding. The change of chemical loss leads to a longer peak response time of N2 abundance than that due to barometric motion. Therefore, an equilibrium is reached after the barometric effect turns from expansion (contraction) to contraction (expansion), so that the peak response time of N2 is longer than that of Tn. Moreover, the meridional circulation in the thermosphere modulates the latitudinal dependence of the peak response time of thermospheric neutral species.

show abstract

Section: Discussionmentioning

confidence: 77%

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A number of recent studies have suggested the possibility of solarinduced changes in the stratosphere on a time scale of 27 days or a solar rotation [Ebel et al, 1981;Heath and Schlesinger, 1983;Hood, 1983]. Such changes in the thermosphere are well correlated with the 27-day modulation of solar EUV flux (2 < 100 nm) as reported by Bourdeau et al [1964]. Recent measurements from the Nimbus 7 and Solar Mesosphere Explorer (SME) satellites show that the modulation of solar irradiances extends far beyond the EUV range London et al, 1984].…”

Section: Introductionmentioning

confidence: 78%

Solar‐induced oscillations in the stratosphere: A myth or reality?

Chandra¹

1985

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

The response of the stratosphere to 27-day variability in solar activity is studied by using ozone and temperature data obtained from the SCR (Selective Chopper Radiometer) and the BUV (backscattered ultraviolet) experiments on Nimbus 4. In the upper stratosphere (~ 2 mbar), where solar UV effects are likely to be maximum, the zonally averaged temperature and ozone mixing ratio in the tropics seem to be related to changes in conventional indices of solar activity over several solar rotations. The temperature and ozone are, however, anticorrelated, with temperature varying in phase and ozone out of phase with solar activity. The tropical oscillations appear to be manifestations of oscillations at high latitudes that are very strong during fall-spring epoch of both the hemispheres. The high-and low-latitude oscillations are almost 180 ø out of phase with a transition region at mid-latitudes (30ø-40ø). Their spectral characteristics and phase suggest a complex interaction of dynamical and chemical processes in the upper stratosphere. This conclusion is further strengthened from the inferred changes in ozone sensitivity with respect to temperature, which shows a continuous decrease from the tropics to high latitudes in both the hemispheres.Atmos. Sci., 40, 769, 1983.Volland, H., and J. Schaefer, Cause and effect in some types of sunweather relationship, Geophys. Res. Lett., 6, 17, 1979.

show abstract

“…On the other hand, most (but not all) experimental results suggest that a close relationship exists between variations in K, and variations in atmospheric temperature. Jacchia and $lowey [1964] observe good correlation between a twoday running mean of K, and neutral lemperature inferred from satellite drag measurement, although Bourdeau et al [1964], using similar measurements, observe no correlation between diurnal maximum atmospheric temperature and the geomagnetic index Y. K•. Evans [1965], using incoherent backscatter techniques, correlates T• and T, with various geomagnetic indices, K•, a• and A•.…”

Section: •-•G/kmentioning

confidence: 99%

Correlation of plasma scale height withK_pin the topside ionosphere

Watt¹

1966

J. Geophys. Res.

View full text Add to dashboard Cite

Using plasma scale height profiles obtained from the Alouette topside sounder and planetary geomagnetic data published in the Journal of Geophysical Research, correlation is observed between Kp and plasma scale height in the topside ionosphere. From the observed correlation it is deduced that nighttime particle temperatures increase by about 4 per cent for each unit increase in Kp and that nighttime midlatitude transition from O+ ions to lighter (He+, H+) ions, normally occurring at around 550 km, rises about 30 km per unit increase in Kp.

show abstract

Time correlation of extreme ultraviolet radiation and thermospheric temperature

Cited by 32 publications

References 6 publications

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

Solar‐induced oscillations in the stratosphere: A myth or reality?

Correlation of plasma scale height withK_pin the topside ionosphere

Contact Info

Product

Resources

About

Time correlation of extreme ultraviolet radiation and thermospheric temperature

Cited by 32 publications

References 6 publications

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

Different Peak Response Time of Daytime Thermospheric Neutral Species to the 27‐Day Solar EUV Flux Variations

Solar‐induced oscillations in the stratosphere: A myth or reality?

Correlation of plasma scale height withKpin the topside ionosphere

Contact Info

Product

Resources

About

Correlation of plasma scale height withK_pin the topside ionosphere