Electron precipitation events in the lower ionosphere and the geospace conditions

Fernandez J.H.; Correia E.

Electron precipitation events in the lower ionosphere and the geospace conditions

Tipo

Artigo

Data de publicação

2013

Periódico

Annals of Geophysics

Citações (Scopus)

1

Autores

Fernandez J.H.
Correia E.

Resumo

We present an analysis of localized ionospheric perturbations detected at Comandante Ferraz Brazilian Antarctic Station (McIlwain parameter L~2.25) as fast-amplitude variations of very low frequency (VLF) signals transmitted from Hawaii (NPM, at 21.4 kHz), also known as Trimpi events. The study covers the first six months of 2007, during the period of minimum activity in the 23rd solar cycle. The occurrence of Trimpi events in the Antarctica peninsula region was studied in association with solarwind parameters in the neighborhood of the Earth (geospace), along with the geomagnetic activity level (Ap, Dst indices). The analysis shows that the Trimpi events occurred predominantly during geomagnetically disturbed periods, but they have a more intricate association with the geospace regimes. The events achieve higher occurrence during the recovery phase of some geomagnetic storms, and also show a close association with electron flux enhancements in the belt region, especially those with higher energy. The higher event incidence occurred a few hours after what we call the 'angle bracket' phenomenon: when the solar wind velocity rises simultaneous with a decrease in its density. © 2013 by the Istituto Nazionale di Geofisica e Vulcanologia. All rights reserved.