Open AccessAtmospheric tides in the ionosphere. III. Lunar tidal variations at Canberra
Author(s) -
D. F. Martyn
Publication year - 1948
Publication title -
proceedings of the royal society of london. series a, mathematical and physical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.814
H-Index - 135
eISSN - 2053-9169
pISSN - 0080-4630
DOI - 10.1098/rspa.1948.0090
Subject(s) - ionosphere , dynamo , isobaric process , geodesy , geophysics , tidal force , atmospheric tide , physics , geology , atmospheric sciences , thermosphere , astronomy , magnetic field , thermodynamics , quantum mechanics
A study has been made of the lunar variations in heights and critical frequencies of theE, F 1 andF 2 regions above Canberra, Australia. Semi-diurnal lunar variations have been found in all these quantities, and the harmonic coefficients determined. From the study of these it is concluded: (a ) that ionospheric lunar variations are caused by ionic drift under the action of the ‘dynamo’ electric forces, and not by simple tidal rise and fall of isobaric surfaces; (b ) that the lunar magnetic variations are not produced in theE, F 1 orF 2 regions.