Eastward propagation of PC4--5 range CNA pulsations in the morning sector observed with scanning narrow beam riometer at L = 6. 1

Journal Article · Mon Feb 01 00:00:00 EST 1988 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL015i002p00168· OSTI ID:5376782

Kikuchi, T; Yamagishi, H; Sato, N

A new type of cosmic noise absorption (CNA) pulsation is observed with a scanning beam riometer with a spatial resolution of 10 km, at Syowa station, Antarctica (L = 6.1). This type of CNA pulsation has a short azimuthal wavelength (80--600 km), correspnding to a large azimuthal m-number (20--180). Most CNA pulsations with a period of 1 to 10 min propagate eastward at a speed of 200 m/s to 3 km/s in the morning sector (5--10 MLT). The eastward propagation direction is opposite to that of CNA pulsations with a small m-number as reported by Olson et al. (1980). The pulsation period tends to increase, while the propagation speed decreases with increasing local time. These results suggest that the source of this new type of CNA pulsation first appears in the nightside magnetosphere and moves toward noon. It is pointed out that the finding of this new CNA pulsation is due to the high spatial resolution (10 km) and narrow antenna beam (13/sup 0/) of the scanning riometer system. copyright American Geophysical Union 1988

• Research Organization: Radio Research Laboratory, Tokyo
• OSTI ID: 5376782
• Journal Information: Geophys. Res. Lett.; (United States), Vol. 15:2
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIATION
ABSORPTION
IONOSPHERE
PLASMA WAVES
EARTH MAGNETOSPHERE
PULSATIONS
RIOMETERS
WAVE PROPAGATION
EARTH ATMOSPHERE
IONIZING RADIATIONS
MEASURING INSTRUMENTS
PLANETARY IONOSPHERES
RADIATIONS
640201* - Atmospheric Physics- Auroral
Ionospheric
& Magetospheric Phenomena