期刊
ANNALES GEOPHYSICAE
卷 27, 期 4, 页码 1593-1603出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-27-1593-2009
关键词
Ionosphere; Electric fields and currents; Ionosphere-atmosphere interactions; Radio science; Ionospheric physics
资金
- CNPq [305923/20080, 131326/2004-4, 130588/20067, 101536/2006-2, 105374/2005-9]
In the present work we show new results regarding equatorial counter electrojet (CEJ) events in the Brazilian sector, based on the RESCO radar, two set of fluxgate magnetometer systems and a digital sounder. RESCO radar is a 50 MHz backscatter coherent radar installed in 1998 at Sao Luis (SLZ, 2.33 degrees S, 44.60 degrees W), an equatorial site. The Digital sounder routinely monitors the electron density profile at the radar site. The magnetometer systems are fluxgate-type installed at SLZ and Eusebio (EUS, 03.89 degrees S, 38.44 degrees W). From the difference between the horizontal component of magnetic field at SLZ station and the same component at EUS (EEJ ground strength) several cases of westward morning electrojet and its normal inversion to the eastward equatorial electrojet (EEJ) have been observed. Also, the EEJ ground strength has shown some cases of CEJ events, which been detected with the RESCO radar too. Detection of these events were investigated with respect to their time and height of occurrence, correlation with sporadic E (Es) layers at the same time, and their spectral characteristics as well as the radar echo power intensity.
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