Improved Photoionization Rates of O2(1Δg) in the D Region

Paulsen, D. E.; Huffman, R. E.; Larrabee, J. C.

doi:10.1029/rs007i001p00051

Cited by 45 publications

(8 citation statements)

References 11 publications

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“…The intensity of the continuum radiation within the wavelength range 102.7-111.8 nm depends on the solar activity according to Paulsen et al (1972).…”

Section: Daytime Conditionsmentioning

confidence: 99%

Electron density profiles in the quiet lower ionosphere based on the results of modeling and experimental data

et al. 2012

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Abstract. The theoretical PGI (Polar Geophysical Institute) model for the quiet lower ionosphere has been applied for computing the ionization rate and electron density profiles in the summer and winter D-region at solar zenith angles less than 80 • and larger than 99 • under steady state conditions. In order to minimize possible errors in estimation of ionization rates provided by solar electromagnetic radiation and to obtain the most exact values of electron density, each wavelength range of the solar spectrum has been divided into several intervals and the relations between the solar radiation intensity at these wavelengths and the solar activity index F 10.7 have been incorporated into the model. Influence of minor neutral species (NO, H 2 O, O, O 3 ) concentrations on the electron number density at different altitudes of the sunlit quiet D-region has been examined. The results demonstrate that at altitudes above 70 km, the modeled electron density is most sensitive to variations of nitric oxide concentration. Changes of water vapor concentration in the whole altitude range of the mesosphere influence the electron density only in the narrow height interval 73-85 km. The effect of the change of atomic oxygen and ozone concentration is the least significant and takes place only below 70 km.Model responses to changes of the solar zenith angle, solar activity (low-high) and season (summer-winter) have been considered. Modeled electron density profiles have been evaluated by comparison with experimental profiles available from the rocket measurements for the same conditions. It is demonstrated that the theoretical model for the quiet lower ionosphere is quite effective in describing variations in ionization rate, electron number density and effective recombination coefficient as functions of solar zenith angle, solar activity and season. The model may be used for solving inverse tasks, in particular, for estimations of nitric oxide concentration in the mesosphere.

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“…The intensity of the continuum radiation within the wavelength range 102.7-111.8 nm depends on the solar activity according to Paulsen et al (1972).…”

Section: Daytime Conditionsmentioning

confidence: 99%

Electron density profiles in the quiet lower ionosphere based on the results of modeling and experimental data

et al. 2012

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“…Only the solar flux at wavelengths from about 103 to 111.8 nm where there are deep absorption minima in the O 2 cross section can be a potential additional source of O 2 ? ions in the D-region (Paulsen et al 1972). The production rate of O 2 ?…”

Section: O2mentioning

confidence: 99%

“…This approximation was derived by Paulsen et al (1972) for solar zenith angles between 0 and 75°, and for altitudes between 70 and 90 km.…”

Section: O2mentioning

confidence: 99%

“…The production rate of O 2 ? ions has been determined and approximated by Paulsen et al (1972) using the photoionization cross section of O 2 ( 1 D g ) given by Huffman et al (1971) at wavelengths of 102.8-111.8 nm and the solar fluxes measured on 11 March 1967 at the Earth's orbit (Hall and Hinteregger 1970) as 2.351 9 10 -3 1.117 9 10 -3 2.625 9 10 -5 2.436 9 10 -3 2.619 9 10 -3 3.519 9 10 -3 5.082 9 10 -3 2 0.4-0.8 5.019 9 10 -4 2.320 9 10 -2 9.238 9 10 -3 3.173 9 10 -4 2.890 9 10 -2 1.891 9 10 -2 3.294 9 10 -2 4.813 9 10 -2 3 0.8-1. …”

Section: O2mentioning

confidence: 99%

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Photochemistry of Ions at D-region Altitudes of the Ionosphere: A Review

Павлов

2013

Surv Geophys

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“…In addition to these major sources of ionization the minor sources like ionization of the metastable oxygen O2 (1dag) and ionization due to cosmic rays were also taken into account in order to have the complete picture of ionization processes in the D-region. Ionization production from O2 (10g) due to solar radiation in the wavelength range 1,027-1,118A has been taken from the reported values of HUFFMAN et al (1971) after adjusting to the recent profiles of O2 (10g) by PAULSEN et al (1972). The cosmic ray ionization has been estimated using the expression given by JAYARAM and CHIN (1967).…”

Section: Theoretical Estimates Of the Components Of Absorptionmentioning

confidence: 99%

Study of lower ionospheric absorption in terms of contributions from solar fluxes in different wavelength bands.

Parameswaran¹

1980

J. geomagn. geoelec

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Noontime absorption on 1.8, 2.0, 2.2 and 2.5 MHz at Trivandrum (magnetic dip -0.6S) can be expressed in terms of solar X-ray and 10.7cm (F10.7) fluxes and the noontime solar zenith angle by an empirical relation. The components of absorption related to X-ray, F10. r and the component independent of these two as obtained from the empirical relation have been examined on the basis of theoretical estimates of contributions to absorption from EUV, X-ray and Lyman-a solar fluxes. The solar activity independent component in the empirical relation is found to agree with the contribution from the solar activity independent component of solar Lyman-a radiation. From the theoretical analysis it has been shown that the wavelength range of solar X-ray effect on absorption for which 1-8A integrated X-ray flux will be a good representative index is 1A to 30-35A.

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Improved Photoionization Rates of O₂(¹Δ_g) in the D Region

Cited by 45 publications

References 11 publications

Electron density profiles in the quiet lower ionosphere based on the results of modeling and experimental data

Electron density profiles in the quiet lower ionosphere based on the results of modeling and experimental data

Photochemistry of Ions at D-region Altitudes of the Ionosphere: A Review

Study of lower ionospheric absorption in terms of contributions from solar fluxes in different wavelength bands.

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