Model studies of the D-region negative-ion composition during day-time and night-time

Thomas, L.; Bowman, M.R.

doi:10.1016/0021-9169(85)90037-6

Cited by 57 publications

(33 citation statements)

References 35 publications

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“…In general, it is similar in most respects to other models of the D region which have appeared in the literature over the last 30 years (e.g. Barabash et al, 2012;Kazil et al, 2003;Thomas and Bowman, 1985). One difference with some other models is a simplifying assumption that OASIS makes concerning negative ions.…”

Section: The Oasis Modelmentioning

confidence: 72%

“…which is not in the Torkar and Friedrich table, but is reaction R17 of Thomas and Bowman (1985). As discussed by Friedrich et al (1998) and Barabash et al (2012), historical impediments to a reliable model-data comparison of the electron density are the uncertainties in such quantities as the NO and O. Friedrich et al (1998) used HALOE data to narrow down the possible range of the NO; here we use the SABER data discussed above to constrain not only the O, but also the O 3 and the O 2 ( 1 Δ).…”

Section: The Oasis Modelmentioning

confidence: 97%

See 1 more Smart Citation

Implications of odd oxygen observations by the TIMED/SABER instrument for lower D region ionospheric modeling

Siskind

Mlynczak

Marshall

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: The Oasis Modelmentioning

confidence: 72%

Section: The Oasis Modelmentioning

confidence: 97%

Implications of odd oxygen observations by the TIMED/SABER instrument for lower D region ionospheric modeling

Siskind

Mlynczak

Marshall

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Note that besides negative dust also negative ions, which were not measured in the frame of the WADIS mission, are an important player in the charge balance in the lower D region (e.g., Baumann et al, 2013Baumann et al, , 2015Plane et al, 2014;Asmus et al, 2015). Nevertheless, negative ion density (predominantly NO − 3 and O − 2 at night around 80 km) are thought to rapidly decrease above 80 km during nighttime due to destruction by atomic oxygen (Thomas and Bowman, 1985;Friedrich et al, 2012;Plane et al, 2014;Baumann et al, 2015). In situ measurements of O density (not shown here) on WADIS-2 show a rapid increase above ∼ 77 km, which supports the assumption that negative ions play only a minor role in the charge balance at those heights.…”

Section: Discussionmentioning

confidence: 99%

Estimate of size distribution of charged MSPs measured in situ in winter during the WADIS-2 sounding rocket campaign

et al. 2017

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Abstract. We present results of in situ measurements of mesosphere-lower thermosphere dusty-plasma densities including electrons, positive ions and charged aerosols conducted during the WADIS-2 sounding rocket campaign. The neutral air density was also measured, allowing for robust derivation of turbulence energy dissipation rates. A unique feature of these measurements is that they were done in a true common volume and with high spatial resolution. This allows for a reliable derivation of mean sizes and a size distribution function for the charged meteor smoke particles (MSPs). The mean particle radius derived from Schmidt numbers obtained from electron density fluctuations was ∼ 0.56 nm. We assumed a lognormal size distribution of the charged meteor smoke particles and derived the distribution width of 1.66 based on in situ-measured densities of different plasma constituents. We found that layers of enhanced meteor smoke particles' density measured by the particle detector coincide with enhanced Schmidt numbers obtained from the electron and neutral density fluctuations. Thus, we found that large particles with sizes > 1 nm were stratified in layers of ∼ 1 km thickness and lying some kilometers apart from each other.

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“…The height distribution of the O 3 -density in the mesosphere, its seasonal and diurnal variations and the secondary peak have been explained by theoretical investigations and by modelling Laird, 1970, 1972;Ogawa and Shimazaki, 1975;Swider et al, 1978;Keneshea et al, 1979;Thomas and Bowman, 1985;Rodrigo et al, 1986;Sandor et al, 1997;Marsh et al, 2003;Jackman et al, 1995Jackman et al, , 2005. The primary chemical production mechanism for odd oxygen in the thermosphere and mesosphere is photodissociation of molecular oxygen.…”

Section: Height Profiles Of Ozone In the Mesospherementioning

confidence: 99%

“…1 by curves 1-3 (Shimazaki and Laird, 1972;Rodrigo et al, 1986;Thomas and Bowman, 1985). Deviations in the concentration of ozone between O 3 -profiles 1-3 can be explained by differences in accounting for solar radiation intensity in different wavelength ranges, in absorption cross sections, in values of eddy diffusion coefficient, in concentration of atomic oxygen and other species, in rate constants of reactions and in other factors applied in the model studies.…”

Section: Height Profiles Of Ozone In the Mesospherementioning

confidence: 99%

The influence of ozone concentration on the lower ionosphere – modelling and measurements during the 29–30 October 2003 solar proton event

2009

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Abstract.A numerical model of D-region ion chemistry is used to study the influence of the ozone concentration in the mesosphere on ion-composition and electron density during solar proton events (SPE). We find a strong sensitivity in the lower part of the D-region, where negative ions play a major role in the ionization balance. We have chosen the strong SPE on 29-30 October 2003 when very intense proton fluxes with a hard energetic spectrum were observed. Deep penetration into the atmosphere by the proton fluxes and strong ionisation allows us to use measurements of electron density, made by the EISCAT 224 MHz radar, starting from as low as 55 km. We compare the electron density profiles with model results to determine which ozone concentration profiles are the most appropriate for mesospheric altitudes under SPE conditions. We show that, during daytime, an ozone profile corresponding to depletion by a factor of 2 compared to minimum model concentrations for quiet conditions (Rodrigo et al., 1986), is needed to give model electron density profiles consistent with observations. Simple incorporation of minor neutral constituent profiles (NO, O and O 3 ) appropriate for SPE conditions into ion-chemistry models will allow more accurate modeling of electron and ion densities during such events, without the need to apply a complete chemical model calculating all neutral species.

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Model studies of the D-region negative-ion composition during day-time and night-time

Cited by 57 publications

References 35 publications

Implications of odd oxygen observations by the TIMED/SABER instrument for lower D region ionospheric modeling

Implications of odd oxygen observations by the TIMED/SABER instrument for lower D region ionospheric modeling

Estimate of size distribution of charged MSPs measured in situ in winter during the WADIS-2 sounding rocket campaign

The influence of ozone concentration on the lower ionosphere – modelling and measurements during the 29–30 October 2003 solar proton event

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