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Long and Short Period Changes in Magnetic Activity at Huancayo During the Solar Cycle
Author(s) -
Chernosky Edwin J.
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/rs004i009p00876
Subject(s) - atmospheric sciences , earth's magnetic field , sunspot , amplitude , equator , geomagnetic storm , environmental science , magnetic dip , climatology , magnetic field , period (music) , physics , geology , geophysics , geodesy , latitude , optics , quantum mechanics , acoustics
Forty years of geomagnetic activity data at Huancayo are evaluated in two periodicities: the hourly and the daily changes of the horizontal magnetic field intensity. Monthly means of both periodicities are affected similarly by solar activity in that they both show the characteristic semiannual variation. Although the amplitudes of the hourly changes follow solar activity changes closely, the daily changes show a ‘bite out’ near sunspot maximum when annual means of each are compared. The ‘bite out’ may be due to the occurrence of magnetic storm depressions of a different duration at that time. The results suggest that the slower magnetic variations at the dip equator should not be studied as a single manifestation but in periodicity bands, as micropulsations are studied.