Source region of 0.2 to 1.0 Hz geomagnetic pulsation bursts

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Geophysical Research Letters

DOI:https://doi.org/10.1029/96GL00659· OSTI ID:245165

Anderson, B J; Erlandson, R E ^[1]; Engebretson, M J ^[2]

---

1. The Johns Hopkins Univ., Laurel, MD (United States)
2. Augsburg College, Minneapolis, MN (United States); and others

Geomagnetic pulsations from 0.2 to 5.0 Hz (Pc 1) observed on the ground could be used to monitor the magnetospheric processes generating them if their source regions were known. The authors report simultaneous observations of Pc 1 bursts at South Pole Station and in space at 9 R{sub E} geocentric distance near the magnetic equator showing that the subsolar outer magnetosphere, earthward of the low latitude boundary layer, is the source region of Pc 1 bursts. The source extends 1 to 2 hours azimuthally and 1 to 2 R{sub E} radially. Correlation of magnetopause displacements and bursts at South Pole indicates that the bursts are simulated by compression of dayside magnetosphere. In space bursts occur above the He{sup +} gyrofrequency implying that the H{sup +}-He{sup +} bi-ion resonance does not prevent the signals from reaching the ionosphere. 17 refs., 4 fig.

• OSTI ID: 245165
• Journal Information: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 7 Vol. 23; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
EARTH MAGNETOSPHERE
GEOMAGNETIC FIELD
LONG WAVE RADIATION
MILLI HZ RANGE
ORIGIN
PULSATIONS