AN INVESTIGATION OP MICROPULSATIONS IN THE EQUATORIAL REGION
AN INVESTIGATION OP MICROPULSATIONS IN THE EQUATORIAL REGION
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Date
1968-01
Authors
ADAH, MOSE S EGENE
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Abstract
As an introduction to the thesis, an account is given
of the previous observational studies of geomagnetic micropulsations
at all latitudes but special attention is given
to low latitude studies. Results obtained from both
magnetic and earth current records are given in the survey.
Reference is made to existing theories concerning the
production of micropulsational phenomena,
An account is given of the experimental methods for the
study of micropulsations and the theory of the action of the
high permeability core magnetometer, the type used in Zaria,
is given in some detail. This is followed by the experimental
particulars and the results of the analysis on pc 3, pc 4 and
pi 2 band micropulsations obtained on the rapid-run magnetograms
at Zaria for the months of July and August 1967. The. main
r e s u l t s includes-
(1) The dominant periodic times of pc 3 and pc 4 are
(38 -+ 3) sec, and (60 -+ 5) sec, and that of pi 2 is
(60 -+ 5) sec.
(2) Pc 3 occurs at a l l local times with two peaks in
occurrence; one in the morning and the other in the
evening, the morning peak at about 06 hrs, (L,T)
being more pronounced. Its peak amplitude is near
local noon.
(3) Pc 4 is essentially a daytime phenomenon with peak
occurrence and amplitude near local noon,
{4) Pi 2 is essentially a night time phenomenon with
•peak occurrence between 22 and 23 hrs (LIT.)
(5) Micropulsation activity is enhanced during magnetically
disturbed periods and the amplitude is larger
in the H than in the D component.
(6) Pc 3, pc 4 and pi 2 micropulsations are linearly
polarized along the magnetic meridian.
The observed periods are compared with resonant periods
predicted by some resonance theories for low latitudes. Also,
the results obtained on pc 3, pc 4 and pi 2 band micropulsations
are compared with those previously obtained at low latitudes.
Description
THESIS
SUBMITTED BY
MOSES EGENE ADAH, B.Sc. (A.B.U.)
FOR THE
SCIENCE
DEGREE OF MASTER
IN THE
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY
ZARIA.
Department of Physics,
January, 1968. Ahmadu Bello University,
ZARIA
Keywords
INVESTIGATION,, MICROPULSATIONS,, EQUATORIAL REGION