Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0817e&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0817
Other
2724 Magnetopause, Cusp, And Boundary Layers, 2731 Magnetosphere: Outer, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Long-period broadband waves (1-50 mHz) have been known for many years to be a dominant feature in the ULF wave spectrum in the dayside cusp/cleft/LLBL region. Multistation studies have shown that such activity cannot be simply associated with boundary layer or cusp proximity; instead it shows a coordinated time dependence across several hours of local time. Recently, this high-latitude broadband wave activity was found to often not be simultaneous in conjugate hemispheres. Earlier studies of magnetic impulse events and riometer data in conjugate high latitude locations showed similar behavior. We present here observations of an extended period of nonconjugate broadband pulsations, and demonstrate that the hemispheric differences can even extend into regions of normally closed field lines. Comparisons of wave activity at latitudinally spaced stations suggest that narrowband Pc 5 wave power at auroral latitudes is directly associated with the broadband wave activity at cusp / cleft / LLBL latitudes in either or both hemispheres. There were extended intervals on this day with a large By component of the interplanetary magnetic field, but these occurred during times of both conjugate and nonconjugate wave activity. These and other observations suggest a possible source of broadband ULF variations in the high-altitude cusp / boundary layer / entry layer regions in each hemisphere, rather than or in addition to a common source at or near the equatorial magnetopause / LLBL.
Engebretson Mark J.
Hughes Jeffrey W.
Posch Jennifer L.
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