NIGHTTIME D-REGION ELECTRON-DENSITY VARIATIONS OBSERVED IN THE SOUTH-ATLANTIC GEOMAGNETIC ANOMALY IN ASSOCIATION WITH SOLAR-PROTON EVENTS

被引：2

作者：

DACOSTA, AM

PIAZZA, LR

机构：

[1] Centro de Rádio Astronomia et Aplicações Espaciais, CRAAE, Escola Politécnica, CEP 01065-970 São Paulo, SP

来源：

JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS | 1995年 / 57卷 / 08期

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1016/0021-9169(94)00068-Y

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Very low frequency signals (VLF) received in Atibaia (Brazil) during the occurrence of the two major solar-proton events of August 1972 and July 1974 were analysed. Phase and amplitude changes observed at night were introduced in the model given by,Wait and Spies (1964) properly adapted to the ionospheric conditions of the South Atlantic Geomagnetic Anomaly (SAGA) region. Electron density disturbed profiles for ''L'' shell intervals 1.15 < L < 2.0 and 1.08 < L < 1.15 were deduced. The results highlight the great amount of ionization produced at low ''L'' values due to the precipitation of energetic particles in the SAGA, mainly at night. Some discrepancies among the electron density profiles proposed by different authors are discussed.

引用

页码：899 / 904

页数：6