Accession Number:

ADA056386

Title:

ALTAIR: An Incoherent Scatter Radar for Equatorial Spread-F Studies.

Descriptive Note:

Topical rept. 1 Jun 77-1 Jan 78,

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Personal Author(s):

• Tsunoda,R. T.
• Baron,M. J.
• Owen,J.

Report Date:

1978-01-01

Pagination or Media Count:

42.0

Abstract:

In this report, we present preliminary results obtained from data collected with ALTAIR, a high-power VHFUHF radar, during the Wideband Equatorial Program. The Wideband Equatorial Program is a coordinated field program sponsored by the Defense Nuclear Agency DNA to study the physical processes underlying the production of intense field-aligned irregularities and the effects of those irregularities on satellite communication channels that operate in the gigahertz frequency range. This radar is sensitive enough for incoherent-scatter measurements as well as being capable of spatially mapping E and F region irregularities as a function of time. With data collected from the operation of ALTAIR in a sector scan mode it is possible to determine the spatial distribution of 1-m spread-F irregularities and their dynamics, and to relate them to the parameters of the background equatorial ionosphere. These relationships provide a means of critically evaluating proposed source mechanisms of equatorial spread-F.

Descriptors:

• *RADAR SIGNALS
• *INCOHERENT SCATTERING
• EQUATORIAL REGIONS
• ELECTRON DENSITY
• BACKSCATTERING
• F REGION
• ULTRAHIGH FREQUENCY
• VERY HIGH FREQUENCY
• IONOSPHERIC PROPAGATION

Subject Categories:

• Atmospheric Physics
• Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE