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Low‐Latitude Ionospheric Electron Content Measurements During Half a Solar Cycle
Author(s) -
Mendonça F.,
Kantor I. J.,
Clemesha B. R.
Publication year - 1969
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs004i009p00823
Subject(s) - ionosphere , anomaly (physics) , total electron content , latitude , physics , atmospheric sciences , doppler effect , solar cycle , electron , content (measure theory) , electron density , solar flare , geodesy , geology , environmental science , astrophysics , geophysics , plasma , solar wind , astronomy , tec , mathematics , mathematical analysis , quantum mechanics , condensed matter physics
This paper presents the results of total electron content measurements made at São José dos Campos (23.22°S, 45.98°W) between 1963 and 1968. The 1963 measurements were made by using the differential Doppler shift technique, and from December 1964 onwards the close‐spaced‐frequency method was employed using the 40 and 41 MHz transmission from the BE‐B and BE‐C satellites. An analysis is made of the variation of electron content with local time, dip angle, season, solar activity, and magnetic activity. Special attention is given to the equatorial anomaly and the region of the Brazilian magnetic anomaly.