Geomagnetic pulsations (5-50 mHz) and the interplanetary magnetic field. [Correlation between enhancements in radial component of IMF and amplitude of pulsations]

Journal Article · Wed Dec 01 04:00:00 EST 1976 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA081i034p05941· OSTI ID:7130606

Webb, D; Orr, D

Geomagnetic pulsations in the 10- to 200-s (Pc 3--4) period range as observed at the earth's surface are often seen to switch on and off during the day. Recordings of earth current measurements made at three stations in the United Kingdom (geomagnetic latitude 55/sup 0/--61/sup 0/N, L=2.6--3.6) were compared with measurements of the interplanetary magnetic field (IMF) made by the Heos 2 satellite. Some events are presented which show a distinct correlation between enhancements in the radial component of the IMF and the amplitude of pulsations in the period range 20--60 s. Computation of the cross-correlation functions suggests a possible diurnal variation in the delay time between the step observed in the IMF and the enhancement of pulsations at the ground (typically approx. 15 min). These observations may give important indications of the generation regions of these ulf waves in the magnetosphere. (AIP)

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 7130606
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 81:34; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640107 -- Astrophysics & Cosmology-- Planetary Phenomena
640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
CURRENTS
DAILY VARIATIONS
EARTH ATMOSPHERE
ELECTRIC CURRENTS
EUROPE
GEOMAGNETIC FIELD
INTERPLANETARY MAGNETIC FIELDS
MAGNETIC FIELDS
MAGNETOSPHERE
PULSATIONS
UNITED KINGDOM
VARIATIONS