Estudo das derivas zonais das irregularidades de plasma ionosférico na região brasileira / Study of ionospheric zonal plasma irregularity drifts over brazilian region

AUTOR(ES)

Pedrina Morais Terra dos Santos

DATA DE PUBLICAÇÃO

2000

RESUMO

A detailed study of the zonal drift velocities of the ionospheric bubbles is carried out using experimental airglow data registered at Cachoeira Paulista (22.50 S, 450 W, dip 300 S)during the period of October to March, between 1980-1994. This study is based upon 172 nights of zonal scanning photometer measurements of OI 630 nm airglow. The zonal velocity magnitudes of the ionospheric bubbles are investigated taking into account the seasonal, solar and geomagnetic effects. In general, it is verified that the zonal velocities of the bubbles decrease with local time and geomagnetic activity, and also that these velocities increase with solar flux F10,7 cm. A detailed analysis of these ionospheric bubble velocities, as a function of geomagnetic activity, shows that the velocity variations expressed as Vfinal - Vinicial are less during quiet nights than during disturbed nights; it is also noted that the mean velocities present the highest (lowest)values during quiet (disturbed)nights of solar maximum (minimum). Analysis of the monthly variations shows that the velocities tend to decrease faster with local time during solar minimum than during solar maximum. The ionospheric bubbles occur more (less)frequently during January (December). It is also observed that the highest mean velocities occur during solar maximum. Comparison between photometric and ionosonde data shows that the occurrence of ionospheric bubbles is closely related to that of the Range Spread F phenomenon. The cases of ionospheric bubbles of long duration are more frequently observed during solar minimum than solar maximum.

ASSUNTO(S)

bolhas de plasma fotômetros plasma bubbles aeroluminescência thermosphere photometers ionosfera termosfera airglow equatorial regions regiões equatoriais earth ionosphere geofÍsica espacial

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