scholarly journals A Comparison of Quiet Time Thermospheric Winds Between FPI Observations and Model Calculations

2018 ◽  
Vol 123 (9) ◽  
pp. 7789-7805 ◽  
Author(s):  
Guoying Jiang ◽  
Jiyao Xu ◽  
Wenbin Wang ◽  
Wei Yuan ◽  
Shunrong Zhang ◽  
...  
Keyword(s):  
Quiet Time ◽  
Model Calculations ◽  
Thermospheric Winds

scholarly journals Equatorial and low latitude thermospheric winds: Measured quiet time variations with season and solar flux from 1980 to 1990

1999 ◽  
Vol 104 (A8) ◽  
pp. 17091-17106 ◽  
Author(s):  
M. A. Biondi ◽  
S. Y. Sazykin ◽  
B. G. Fejer ◽  
J. W. Meriwether ◽  
C. G. Fesen
Keyword(s):  
Solar Flux ◽  
Quiet Time ◽  
Low Latitude ◽  
Time Variations ◽  
Thermospheric Winds

High-latitude thermospheric winds: Satellite data and model calculations

2011 ◽  
Vol 5 (3) ◽  
pp. 439-446 ◽  
Author(s):  
M. Förster ◽  
A. A. Namgaladze ◽  
E. N. Doronina ◽  
B. E. Prokhorov
Keyword(s):  
Satellite Data ◽  
High Latitude ◽  
Model Calculations ◽  
Thermospheric Winds

Thermospheric Dynamics in Quiet and Disturbed Conditions

2017 ◽  
Vol 13 (S335) ◽  
pp. 151-158
Author(s):  
Aziza Bounhir ◽  
Zouhair Benkhaldoun ◽  
Jonathan J. Makela ◽  
Mohamed Kaab ◽  
Brian Harding ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Seasonal Effect ◽  
Quiet Time ◽  
Seasonal Behavior ◽  
Wind Pattern ◽  
Fabry Perot ◽  
Thermospheric Winds ◽  
Thermospheric Dynamics ◽  
Diurnal Tides

AbstractThis paper presents the thermospheric winds and temperature properties measured with a Fabry-Pérot interferometer (FPI) over Oukaimeden observatory (31.2°N, 7.8°W, 22.8°N magnetic) in Morocco. After Three years of successful functioning from 2014 to 2017, we can address the seasonal behavior of the temperature and the winds (vertical, zonal and meridional). The dependence of the thermospheric winds and temperature on the solar cycle is also presented. The day-to-day variations of the quiet time wind pattern exhibits the importance of other type of waves superposed to the main diurnal tides. The storm time wind and temperature exhibits also a variety of ways to react to the storm. However, there is seasonal effect to the storm that will be illustrated in this paper. The signature of the MTM phenomenon is also present in the winds and temperature in geomagnetically quiet and disturbed nights. The occurrence of this phenomenon over the studied area is also addressed.

Daytime F2-layer positive storm effect at middle and lower latitudes

1995 ◽  
Vol 13 (5) ◽  
pp. 532-540 ◽  
Author(s):  
A. V. Mikhailov ◽  
M. G. Skoblin ◽  
M. Förster
Keyword(s):  
Background Level ◽  
Gas Composition ◽  
Night Time ◽  
Model Calculations ◽  
Plasma Drift ◽  
Neutral Gas ◽  
Storm Effect ◽  
Thermospheric Winds ◽  
Time Sector ◽  
Composition Changes

Abstract. Daytime F2-layer positive storm effects at middle and lower latitudes in the winter thermosphere are analyzed using AE-C, ESRO-4 neutral gas composition data, ground-based ionosonde observations and model calculations. Different longitudinal sectors marked by the storm onset as 'night-time' and 'daytime' demonstrate different F2-layer positive storm mechanisms. Neutral composition changes in the 'night-time' sector with increased [O] and [N2] absolute concentrations, while (N2/O)storm/(N2/O)quiet\\approx1 at F2-layer heights, are shown to contribute largely to the background NmF2 increase at lower latitudes lasting during daytime hours. Storm-induced surges of the equatorward wind give rise to an additional NmF2 increase above this background level. The mid-latitude F2-layer positive storm effect in the 'daytime' sector is due to the vertical plasma drift increase, resulting from the interaction of background (poleward) and storm-induced (equatorward) thermospheric winds, but not to changes of [O] and [N2] concentrations.

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

Influence of stable iodine on the uptake of the thyroid – model vs. experiment

2001 ◽  
Vol 40 (01) ◽  
pp. 31-37 ◽  
Author(s):  
U. Wellner ◽  
E. Voth ◽  
H. Schicha ◽  
K. Weber
Keyword(s):  
Time Course ◽  
Compartment Model ◽  
The Body ◽  
Iodine Uptake ◽  
Model Calculations ◽  
Physiological Conditions ◽  
Iodine Supply ◽  
Predicted Values ◽  
The Individual ◽  
Stable Iodine

Summary Aim: The influence of physiological and pharmacological amounts of iodine on the uptake of radioiodine in the thyroid was examined in a 4-compartment model. This model allows equations to be derived describing the distribution of tracer iodine as a function of time. The aim of the study was to compare the predictions of the model with experimental data. Methods: Five euthyroid persons received stable iodine (200 μg, 10 mg). 1-123-uptake into the thyroid was measured with the Nal (Tl)-detector of a body counter under physiological conditions and after application of each dose of additional iodine. Actual measurements and predicted values were compared, taking into account the individual iodine supply as estimated from the thyroid uptake under physiological conditions and data from the literature. Results: Thyroid iodine uptake decreased from 80% under physiological conditions to 50% in individuals with very low iodine supply (15 μg/d) (n = 2). The uptake calculated from the model was 36%. Iodine uptake into the thyroid did not decrease in individuals with typical iodine supply, i.e. for Cologne 65-85 μg/d (n = 3). After application of 10 mg of stable iodine, uptake into the thyroid decreased in all individuals to about 5%, in accordance with the model calculations. Conclusion: Comparison of theoretical predictions with the measured values demonstrated that the model tested is well suited for describing the time course of iodine distribution and uptake within the body. It can now be used to study aspects of iodine metabolism relevant to the pharmacological administration of iodine which cannot be investigated experimentally in humans for ethical and technical reasons.

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