scholarly journals Lunar atmospheric tidal effects in the plasma drifts observed by the Low-Latitude Ionospheric Sensor Network

2011 ◽  
Vol 116 (A7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Vince Eccles ◽  
Donald D. Rice ◽  
Jan J. Sojka ◽  
Cesar E. Valladares ◽  
Terence Bullett ◽  
...  
Keyword(s):  
Sensor Network ◽  
Tidal Effects ◽  
Low Latitude ◽  
Plasma Drifts

scholarly journals LION: A dynamic computer model for the low-latitude ionosphere

2007 ◽  
Vol 25 (11) ◽  
pp. 2371-2392 ◽  
Author(s):  
J. A. Bittencourt ◽  
V. G. Pillat ◽  
P. R. Fagundes ◽  
Y. Sahai ◽  
A. A. Pimenta
Keyword(s):  
Magnetic Field ◽  
Time Evolution ◽  
Computer Model ◽  
Transport Processes ◽  
Time Dependent ◽  
Low Latitude ◽  
Radiation Chemical ◽  
Neutral Winds ◽  
Plasma Drifts ◽  
Low Latitude Ionosphere

Abstract. A realistic fully time-dependent computer model, denominated LION (Low-latitude Ionospheric) model, that simulates the dynamic behavior of the low-latitude ionosphere is presented. The time evolution and spatial distribution of the ionospheric particle densities and velocities are computed by numerically solving the time-dependent, coupled, nonlinear system of continuity and momentum equations for the ions O+, O2+, NO+, N2+ and N+, taking into account photoionization of the atmospheric species by the solar extreme ultraviolet radiation, chemical and ionic production and loss reactions, and plasma transport processes, including the ionospheric effects of thermospheric neutral winds, plasma diffusion and electromagnetic E×B plasma drifts. The Earth's magnetic field is represented by a tilted centered magnetic dipole. This set of coupled nonlinear equations is solved along a given magnetic field line in a Lagrangian frame of reference moving vertically, in the magnetic meridian plane, with the electromagnetic E×B plasma drift velocity. The spatial and time distribution of the thermospheric neutral wind velocities and the pattern of the electromagnetic drifts are taken as known quantities, given through specified analytical or empirical models. The model simulation results are presented in the form of computer-generated color maps and reproduce the typical ionization distribution and time evolution normally observed in the low-latitude ionosphere, including details of the equatorial Appleton anomaly dynamics. The specific effects on the ionosphere due to changes in the thermospheric neutral winds and the electromagnetic plasma drifts can be investigated using different wind and drift models, including the important longitudinal effects associated with magnetic declination dependence and latitudinal separation between geographic and geomagnetic equators. The model runs in a normal personal computer (PC) and generates color maps illustrating the typical behavior of the low-latitude ionosphere for a given longitudinal region, for different seasons, geophysical conditions and solar activity, at each instant of time, showing the time evolution of the low-latitude ionosphere, between about 20° north and south of the magnetic equator. This paper presents a detailed description of the mathematical model and illustrative computer results.

Mid- and low-latitude prompt-penetration ionospheric zonal plasma drifts

1998 ◽  
Vol 25 (16) ◽  
pp. 3071-3074 ◽  
Author(s):  
Bela G. Fejer ◽  
Ludger Scherliess
Keyword(s):  
Low Latitude ◽  
Plasma Drifts

scholarly journals Longitudinal dependence of middle and low latitude zonal plasma drifts measured by DE-2

2007 ◽  
Vol 25 (12) ◽  
pp. 2551-2559 ◽  
Author(s):  
J. W. Jensen ◽  
B. G. Fejer
Keyword(s):  
Middle Latitude ◽  
Early Morning ◽  
Quiet Time ◽  
Low Latitude ◽  
Late Night ◽  
Middle Latitudes ◽  
Plasma Drifts ◽  
Longitudinal Variations ◽  
December Solstice ◽  
European Sector

Abstract. We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the European sector and the low latitude eastward drifts are largest in the American-Pacific sector. The longitudinal variations of the late night-early morning drifts during June and December solstice are anti-correlated. During geomagnetically active times, there are large westward perturbation drifts in the late afternoon-early night sector at upper middle latitudes, and in the midnight sector at low latitudes. The largest westward disturbed drifts during equinox occur in European sector, and the smallest in the Pacific region. These results suggest that during equinox SAPS events occur most often at European longitudes. The low latitude perturbation drifts do not show significant longitudinal

scholarly journals PERTURBAÇÕES NO CAMPO GEOMAGNÉTICO CAUSADAS PELO TERREMOTO E PELO TSUNAMI DE MAULE, CHILE (2010)

2020 ◽  
Vol 6 (2) ◽  
pp. 283-291
Author(s):  
Virginia Klausner ◽  
Marina Vedelago Cezarini ◽  
Thiago de Almeida Santos
Keyword(s):  
Sensor Network ◽  
Low Latitude

Este estudo foca na análise das perturbações do campo geomagnético que estão relacionadas com o terremoto, e consequente tsunami, que ocorreram em 27 de fevereiro de 2010 em Maule, no Chile. O objetivo deste artigo é contribuir para uma melhor compreensão dos processos físicos envolvidos nos acoplamentos Tsunami-Atmosfera-Ionosfera (TAI) e Litosfera-Atmosfera-Ionosfera (LAI). Para isto, foram utilizados registros de magnetômetros fluxgate medidos em superfície fornecidos pelo projeto LISN (do inglês Low Latitude Ionospheric Sensor Network). A metodologia de filtragem do sinal por remoção da tendência relacionada à influência solar (linha de base Sq, do inglês Solar quiet) considerando os cinco dias geomagneticamente mais calmos foi aplicada. Os resultados mostraram distúrbios geomagnéticos, em ambas componentes H e Z, nos dados filtrados que ocorreram quase instantaneamente ou com atraso de até 100 minutos após a chegada do tsunami. Estes distúrbios são atribuídos aos mecanismos oceânico e ionosférico. Estudos como esse são importantes para uma futura condição de previsão e alerta de desastres dessa natureza.

Low-latitude plasma drifts from a simulation of the global atmospheric dynamo

1993 ◽  
Vol 98 (A4) ◽  
pp. 6039-6046 ◽  
Author(s):  
D. J. Crain ◽  
R. A. Heelis ◽  
G. J. Bailey ◽  
A. D. Richmond
Keyword(s):  
Low Latitude ◽  
Plasma Drifts
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