A comparative study of electron cooling rates in the Venus ionosphere during magnetized and unmagnetized conditions

1996 ◽  
Vol 101 (E4) ◽  
pp. 9253-9259 ◽  
Author(s):  
K. K. Mahajan ◽  
H. O. Upadhyay ◽  
Suchita Ghosh
Keyword(s):  
Comparative Study ◽  
Electron Cooling ◽  
Cooling Rates

Measurement of Momentum Cooling Rates with Electron Cooling at NAP-M

1979 ◽  
Vol 26 (3) ◽  
pp. 3487-3489
Author(s):  
V. V. Parchomchuk ◽  
D. V. Pestrikov ◽  
A. G. Ruggiero
Keyword(s):  
Electron Cooling ◽  
Cooling Rates

scholarly journals New electron energy transfer and cooling rates by excitation of O2

1998 ◽  
Vol 16 (8) ◽  
pp. 1007-1013 ◽  
Author(s):  
A. V. Pavlov
Keyword(s):  
Energy Transfer ◽  
Electron Energy ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Electron Cooling ◽  
Vibrationally Excited ◽  
Cooling Rates ◽  
Production Frequency ◽  
Electron Energy Loss ◽  
Analytical Expressions

Abstract. In this work I present the results of a study of the electron cooling rate, the production rates of vibrationally excited O2, and the production frequency of the O2 vibrational quanta arising from the collisions of electrons with O2 molecules as functions of the electron temperature. The electron energy transfer and cooling rates by vibrational excitation of O2 have been calculated and fitted to analytical expressions by use of the revised vibrationally excited O2 cross sections. These new analytical expressions are available to the researcher for quick reference and accurate computer modeling with a minimum of calculations. It is also shown that the currently accepted rate of electron energy loss associated with rotational transitions in O2 must be decreased by a factor of 13.

Hot electron cooling rates via the emission of LO-phonons in InN

2004 ◽  
Vol 19 (8) ◽  
pp. 1024-1028 ◽  
Author(s):  
D Zanato ◽  
N Balkan ◽  
B K Ridley ◽  
G Hill ◽  
W J Schaff
Keyword(s):  
Hot Electron ◽  
Electron Cooling ◽  
Cooling Rates ◽  
Hot Electron Cooling

scholarly journals An anomalous subauroral red arc on 4 August, 1972: comparison of ISIS-2 satellite data with numerical calculations

1999 ◽  
Vol 17 (11) ◽  
pp. 1411-1425 ◽  
Author(s):  
V. V. Lobzin ◽  
A. V. Pavlov ◽  
N. M. Pavlova
Keyword(s):  
Electron Density ◽  
Geomagnetic Storm ◽  
Loss Rate ◽  
Emission Rate ◽  
Integral Intensity ◽  
Electron Cooling ◽  
Vibrationally Excited ◽  
Cooling Rates ◽  
Peak Density ◽  
Volume Emission

Abstract. This study compares the Isis II satellite measurements of the electron density and temperature, the integral airglow intensity and volume emission rate at 630 nm in the SAR arc region, observed at dusk on 4 August, 1972, in the Southern Hemisphere, during the main phase of the geomagnetic storm. The model results were obtained using the time dependent one-dimensional mathematical model of the Earth's ionosphere and plasmasphere (the IZMIRAN model). The major enhancement to the IZMIRAN model developed in this study to explain the two component 630 nm emission observed is the analytical yield spectrum approach to calculate the fluxes of precipitating electrons and the additional production rates of N+2, O+2, O+(4S), O+(2D), O–(2P), and O+(2P) ions, and O(1D) in the SAR arc regions in the Northern and Southern Hemispheres. In order to bring the measured and modelled electron temperatures into agreement, the additional heating electron rate of 1.05 eV cm–3 s–1 was added in the energy balance equation of electrons at altitudes above 5000 km during the main phase of the geomagnetic storm. This additional heating electron rate determines the thermally excited 630 nm emission observed. The IZMIRAN model calculates a 630 nm integral intensity above 350 km of 4.1 kR and a total 630 nm integral intensity of 8.1 kR, values which are slightly lower compared to the observed 4.7 kR and 10.6 kR. We conclude that the 630 nm emission observed can be explained considering both the soft energy electron excited component and the thermally excited component. It is found that the inclusion of N2(v > 0) and O2(v > 0) in the calculations of the O+(4S) loss rate improves the agreement between the calculated Ne and the data on 4 August, 1972. The  N2(v > 0) and O2(v > 0) effects are enough to explain the electron density depression in the SAR arc F-region and above F2 peak altitude. Our calculations show that the increase in the O++N2 rate factor due to the vibrationally excited nitrogen produces the 5–19% reductions in the calculated quiet daytime peak density and the 16–24% decrease in NmF2 in the SAR arc region. The increase in the O++N2 loss rate due to vibrationally excited O2 produces the 7–26% decrease in the calculated quiet daytime peak density and the 12–26% decrease in NmF2 in the SAR arc region. We evaluated the role of the electron cooling rates by low-lying electronic excitation of O2(a1Δg) and O2(b1Σg+), and rotational excitation of O2, and found that the effect of these cooling rates on Te can be considered negligible during the quiet and geomagnetic storm period 3-4 August, 1972. The energy exchange between electron and ion gases, the cooling rate in collisions of O(3P) with thermal electrons with excitation of O(1D), and the electron cooling rates by vibrational excitation of O2 and N2 are the largest cooling rates above 200 km in the SAR arc region on 4 August, 1972. The enhanced IZMIRAN model calculates also number densities of N2(B3Πg+),N2(C3Πu), and N2(A3Σu+) at several vibrational levels, O(1S), and the volume emission rate and integral intensity at 557.7 nm in the region between 120 and 1000 km. We found from the model that the integral intensity at 557.7 nm is much less than the integral intensity at 630 nm.Key words. Atmospheric composition and structure (airglow and aurora; thermosphere – composition and chemistry) · Ionosphere (ionosphere – magnetosphere interactions)

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