Physics
Scientific paper
Mar 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..173o&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 3, pp. 173-190
Physics
5
Scientific paper
We have studied the spatial distribution of the incidence and amplitude of fluctuations in the geomagnetic horizontal field in the range of a few gammas to about 50 [gamma](1 [gamma] = 10-5 gauss) and in duration from a few minutes to about 2 hr, and found that: 1. (a) almost all the fluctuations observed at the equatorial observatory at Ibadan are identifiable under favourable conditions up to +60° geographic latitude and are very likely world-wide; 2. (b) the amplitude of fluctuations is sensitively dependent on local time and the strength of Sq current; 3. (c) the amplitude of fluctuations is enhanced by about the same factor as Sq(H) at the magnetic zero dip equator and reaches a maximum at the same place as Sq(H) under the equatorial electrojet; 4. (d) neither the ratio of the amplitudes of a fluctuation in H at two observatories nor the ratio of the fluctuation in the two magnetic elements H and Z at Ibadan is affected by the intensity of magnetic disturbance. It is argued that no existing theory gives a completely satisfactory cause of geomagnetic fluctuations in the low latitudes. A hypothesis requiring the emission of radiation as incoming plasma suffers some interaction at the outer fringes of the earth's upper atmosphere is tentatively suggested. It is suggested that the diurnal variation of the frequency of occurrence of sudden commencements; and sudden impulses could be explained from the diurnal variation of their amplitude.
Ogbuehi P. O.
Onwumechilli Agodi
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