Low-frequency upstream wave as a probable source of low-latitude Pc 3-4 magnetic pulsations

Details Low-frequency upstream wave as a probable source of low-latitude Pc 3-4 magnetic pulsations Low-frequency upstream wave as a probable source of low-latitude Pc 3-4 magnetic pulsations

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..239y&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Feb. 1985, p. 239-249.

Computer Science

26

Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Compression Waves, Daytime, Frequency Distribution, Goes 2, Tropical Regions

Scientific paper

The relationship between the IMF magnitude (B/IMF/) observed by ISEE 3 and Pc 3-4 pulsation frequencies (f) observed both at GOES 2 and at globally coordinated stations on the ground (SGC, EWA, and ONW) is discussed. The relations between the cone angle of the IMF and the pulsation activities at the low latitudes are investigated. The results of the analysis indicate that: (1) daytime Pc 3-4 activities are controlled by the cone angle of the IMF; (2) the correlations between the Pc 3-4 frequencies and the IMF magnitude at low latitudes are better than at high latitudes; (3) both frequencies of the daytime compressional Pc 3-4 waves and the Pc 3-4 pulsations at the stations on the ground are correlated with the strength of IMF, the correlation coefficient between the pulsation frequencies and the IMF magnitude is higher at GOES 2 than at the ground stations; and (4) the scatter plots of the Pc 3-4 waves show a distribution restricted within the forms f = 4.5 x B(IMF) and f = 7.5 x B(IMF). It is concluded that magnetosonic right-handed waves excited by the anomalous ion cyclotron resonance with reflected ion beams in the earth's foreshock are a probable source of the daytime Pc 3-4 magnetic pulsations.

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