Wave normal direction and spectral properties of whistler mode hiss observed on the DE 1 satellite

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA093iA07p07493· OSTI ID:5222622

Sonwalkar, V S; Inan, U S ^[1]

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1. Stanford Univ., CA (USA)

A new study of magnetospheric hiss as a spatially and temporally enduring phenomenon is undertaken using a recently developed formalism that allows the representation of hiss by a field distribution function (FDF). The authors have analyzed hiss signals received by electric and magnetic field antennae aboard the DE 1 satellite during an {approximately} 3-hour period on September 23, 1983. A band of hiss at frequencies < 2 kHz was observed continuously from 0236 UT to 0539 UT over a range of geomagnetic latitudes. Electron density deduced from the in situ and remote measurements indicates that during this time the DE 1 satellite was near the boundary of the plasmasphere. Observations are summarized. The results of the analysis can be summarized as follows: (1) Near the geomagnetic equator (within {approximately} {plus minus} 3{degree} latitude) they observe a wave normal angle of 60{degree} {plus minus} 5{degree} with respect to the local geomagnetic field. (2) Away from the equator, wave normal directions range from 30{degree} to 80{degree} with respect to the local geomagnetic field. (3) All wave normal directions observed over the 3-hour-long period were within {approximately}{plus minus} 45{degree} of the plane normal to the local magnetic meridional plane. Results indicate that the hiss source radiates with initial wave normal angles in the range 30{degree} < {theta}{sub 0} < {theta}{sub g} (Gendrin angle) and 90{degree} < {theta}{sub 0} < 270{degree}, contrary to the common assumption that the source emits with wave normal angles closely aligned with the geomagnetic field. The FEF formulation has also permitted elucidation of the statistical nature of hiss. The slow time fading ({approximately} 30 s) is interpreted in terms of a coherence bandwidth {Delta}{omega} of about 0.2 rad/s.

• OSTI ID: 5222622
• Journal Information: Journal of Geophysical Research; (United States), Vol. 93:A7; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH MAGNETOSPHERE
WHISTLERS
AURORAL HISS
DISTRIBUTION FUNCTIONS
ELECTRIC FIELDS
ELECTRON DENSITY
MAGNETIC FIELDS
PLASMASPHERE
SATELLITES
STATISTICS
WAVE PROPAGATION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
FUNCTIONS
MATHEMATICS
NOISE
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
640201* - Atmospheric Physics- Auroral
Ionospheric
&amp; Magetospheric Phenomena