Terrestrial kilometric radiation 2. Emission from the magnetospheric cusp and dayside magnetosheath

Journal Article · Sat Jan 01 00:00:00 EST 1977 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA082i001p00098· OSTI ID:7312319

Alexander, J K; Kaiser, M L

Measurements of the location of sources of terrestrial kilometric radiation obtained with the lunar-orbiting Radio Astronomy Explorer 2 satellite have revealed a class of emission associated with the cusp and dayside magnetosheath. At frequencis near 250 kHz this emission is observed at radial distances between 2 and 20 R/sub E/ at magnetic latitudes of 75degree-80degree and is most often detected during periods of auroral activity (AEapproximately-greater-than250) and southward orientation of the interplanetary magnetic field vertical component. During very disturbed times the emission at the lowest frequencies (approximately-less-than200kHz) appears to come from the dayside magnetosheath at distances of approximately-greater-than12 R/sub E/. Whenever the geomagnetic dipole is tilted significantly with respect to the ecliptic pole (approximately-greater-than10degree), the cusp emission is confined to the hemisphere containing the subsolar point. The measurements also suggest that the region of cusp emission is rather narrowly confined in longitude to within a few hours of the noon meridian. (AIP)

• Research Organization: Planetary Sciences Branch, Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center Greenbelt, Maryland 20771
• OSTI ID: 7312319
• Journal Information: J. Geophys. Res.; (United States), Vol. 82:1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MAGNETOSPHERE
RADIOWAVE RADIATION
AURORAL ZONES
INTERPLANETARY MAGNETIC FIELDS
MAGNETIC STORMS
MAGNETOSHEATH
SOLAR WIND
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
MAGNETIC FIELDS
RADIATIONS
SOLAR ACTIVITY
640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987)