Computer Science
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1157h&link_type=abstract
Planetary and Space Science, vol. 22, Aug. 1974, p. 1157-1172.
Computer Science
55
Atmospheric Attenuation, Geomagnetic Micropulsations, Ionospheric Propagation, Magnetohydrodynamic Waves, Boundary Conditions, Boundary Value Problems, Earth Magnetosphere, Lines Of Force, Transverse Waves
Scientific paper
A study is made of the screening effect of the atmosphere and ionosphere which lets only part of a magnetospheric micropulsation signal reach the ground. Analytical expressions are obtained which relate the magnetic field in the magnetosphere to that on the ground; these expressions are confirmed by computing a full solution. Only the part of the signal with no vertical current will be seen on the ground; this agrees with previous work. Using this result, it is found that the reflection condition of a transverse hydromagnetic wave incident on the top of the ionosphere indicates a 'fixed-end' boundary condition for the field line. To a first approximation, micropulsation polarizations observed on the ground must be rotated through a right angle to obtain those in the magnetosphere. The strength of the electric field predicted in the ionosphere agrees with radio aurorae observations.
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