Seasonal and diurnal dependence of Pc 3-5 magnetic pulsation power at geomagnetically conjugate stations in the auroral zones

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JA094iA06p06945· OSTI ID:6048640

Saito, Hiroaki ^[1]; Sato, Natsuo ^[2]; Tonegawa, Yutaka ^[3]; Yoshino, Takeo ^[4]; Saemundsson, T ^[5]

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1. Univ. of Electro-Communications, Tokyo (Japan) National Institute of Polar Research, Tokyo (Japan)
2. National Institute of Polar Research, Tokyo (Japan)
3. Tokai Univ., Hiratsuka (Japan)
4. Univ. of Electro-Communications, Tokyo (Japan)
5. Univ. of Iceland, Reykjavik (Iceland)

Seasonal and diurnal variations of Pc 3-5 magnetic pulsation powers have been examined using 2 years of magnetic data from geomagnetically conjugate stations, Syowa in Antarctica and Husafell and Tjoernes in Iceland. The magnetic pulsation powers are found to be relatively higher at the winter hemisphere station than at the summer station. The pulsations observed during equinox show a diurnal dependence, i.e., that the power density is higher in the geomagnetic morning at the stations in Iceland than at Syowa, and this relationship is reversed in the afternoon. The power density ratio of Pc 3 pulsations between the conjugate stations, which is associated with the seasons and with local time, is higher than that of Pc 5. These characteristics can be attributed to the effects of sunlight in the ionosphere, i.e., Pc 3-5 pulsations are shielded when the waves propagate from the magnetosphere to the ground through the sunlit ionosphere.

• OSTI ID: 6048640
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:A6; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL ZONES
DAILY VARIATIONS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
GEOMAGNETIC CONJUGACY
HYDROMAGNETIC WAVES
IONOSPHERE
PLANETARY IONOSPHERES
SEASONAL VARIATIONS
VARIATIONS
WAVE PROPAGATION