On the two‐stream approach to electron transport and thermalization

Stamnes, Knut

doi:10.1029/ja086ia04p02405

Cited by 63 publications

(19 citation statements)

References 17 publications

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“…Stamnes [1981]. It is apparent that the effect of collision is sufficiently small in tile energy range higher than the peak energy and in the altitude range higher than 170 kin.…”

Section: I(e) = (2•rameg) « Exp ( -E--•---) (6) Eo = Em + Ea (7)mentioning

confidence: 95%

Rocket observation of the magnetosphere‐ionosphere coupling processes in quiet and active arcs

Shiokawa¹,

Fukunishi²,

Yamagishi³

et al. 1990

J. Geophys. Res.

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Magnetosphere-ionosphere coupling processes in inverted-V electron precipitation regions have been investigated ing particle and magnetic field data obtained from two antarctic sounding rockets S-310JA-11, and S-310JA-12, launched into quiet and active auroral arcs, respectively. These data have suggested the presence of a liltear relation between field-aligned current and fieldaligned potential difference, i.e., Jll = KVII , given by Fridman and Lemaire [1980] and Lyons [1980]. The density n and thermal energy E0of primary electrons have been obtMned by fitting accelerated Ma.xwellian distribution functions to tile observed electron energy spectra. It is found that the thermal energy E0 is larger illside the arcs than outside tile arcs for both the quiet and active arcs observed, suggesting that precipitating electrons are heated during the field-aligned acceleration. In contrast, tile electron density n is enhanced outside tile arcs for the quiet arc eVelit, while it is enhanced inside tile arcs for the active arc event. !,'r(,•l nn investigation of the relation between E0 and Vii and also the relation between Eo and ill, it is suggested that tile heating occurs effectively wheia tile current intensity exceeds a certain threshold and that the electron heating rate is 5-40% of the energy gain due to the field-aligned acceleration. Assuming that this heating is due to Jo,le heating thro,gh anomalous resistivity, it is also SUggest, e([ that tile total ano•alous resistivity along tile magnetic field line decreases with an increase of R.

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“…Stamnes [1981]. It is apparent that the effect of collision is sufficiently small in tile energy range higher than the peak energy and in the altitude range higher than 170 kin.…”

Section: I(e) = (2•rameg) « Exp ( -E--•---) (6) Eo = Em + Ea (7)mentioning

confidence: 95%

Rocket observation of the magnetosphere‐ionosphere coupling processes in quiet and active arcs

Shiokawa¹,

Fukunishi²,

Yamagishi³

et al. 1990

J. Geophys. Res.

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“…As computers became faster and more available, numerical techniques were developed. Monte Carlo methods were employed [ Cicerone and Bowhill , 1971] and the equation of transfer was solved using two stream [ Nagy and Banks , 1970; Stamnes , 1981a, 1981b] and multistream methods [ Strickland et al , 1976; Oran and Strickland , 1978; Link , 1982]. Rapid calculation of photoelectron excitation rates was performed assuming the local approximation [ Strickland and Meier , 1982].…”

Section: Calculation Of Energetic Electron Impact Ionization and Dissmentioning

confidence: 99%

A model of nitric oxide in the lower thermosphere

2002

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[1] A model of NO abundance in the lower thermosphere is described. The model includes time dependence, an energetic electron flux calculation that includes transport, neutral and ion photochemistry, and vertical diffusion. We show that a steady state calculation is inadequate for calculating NO abundance. We examine the relationship between observed NO abundance and the integrated energy input to the lower thermosphere over the previous day. It is shown that the relationship between the energy input and the NO abundance varies with the local time of the NO measurement and with the length of daylight. These dependencies arise due to the role of photodissociation as a loss mechanism for NO. This model is designed for analysis of NO observations and will be used in the analysis of observations by the SNOE spacecraft .

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“…Frictional processes become important at low energies (less than the ionization threshold) and do not influence the secondary electron production. The last term represents the electron production due to degradation of higher-energy fluxes through collisions between suprathermal electrons and neutral particles (Mantas 1973, Oran and Strickland 1978, Stamnes 1981. R l is defined as the ratio of the sum of differential cross sections (sum over the different reactions (inelastic and elastic) between the electrons and neutrals) to the total cross section σ T l (Lummerzheim and Lilensten 1994, and references therein).…”

Section: The Transport Model At Titanmentioning

confidence: 99%