Subject Categories:
510302
560151*
-- Radiation Effects on Animals -- Man
-- Environment, Terrestrial -- Radioactive Materials Monitoring
& Transport -- Terrestrial Ecosystems & Food Chains -- (-1987)
INIS Subject Categories: C15*
-- Effects of External Radiation on Man
C22
-- Radionuclide Ecology
10/5/919
00585554
(Item 619 from file:
EDB-80-025076
103)
Author(s): Livingston, R.C.
.
Title: Comparative equatorial scintillation morphology--American and
Pacific sectors.
Topical report no. 3, 1 June 1977-30 June 1978
Corporate Source:
Publication Date:
Report Number(s):
SRI
International,
30 Jun 1978
AD-A-066094
Contract Number (DOE):
Document Type: Report
p 55
Menlo Park,
CA
(USA)
DNA0Q01-77-C-0220
Language: English
Journal Announcement: EDB7908
Availability: NTIS, PC AQ4/MF A0Ol.
Subfile:
NTS
(NTIS).
Country of Origin: United States
Country of Publication: United States
Abstract: This report examines the severity of radio-wave amplitude
scintillation measured at two stations near the equator, but far apart
in longitude: Kwajalein Atoll in the Marshall Islands, and Ancon, Peru.
The data used are observations of the Wideband satellite signal
intensity at VHF, UHF, and L-band frequencies. These are presented in
terms of the cumulative distribution of S4 index, which provides a
precise measure of the level of disturbance that can be readily related
to the distribution of signal intensity. The seasonal behavior of the
scintillation at the two stations is similar, with each showing a broad
8-to-9-month disturbed season centered about local summer. There is
little difference in the occurrence or severity of gigahertz
scintillation at the two stations. However, there is a systematic
difference between the frequency dependences of the scintillation. The
latitude distributions of scintillation show the expected enhancement
from propagation geometry at low elevation angles. When these effects
are removed to obtain irregularity source strength, the irregularity
source regions are found at some distance from the magnetic equator. It
is suggested that the weak-to-moderate scintillation that dominates the
observations arises from interactions between neutral waves and
lonization in the F region.;
Major Descriptors: *F REGION -- KINETICS;
*IONOSPHERE -- WAVE PROPAGATION;
*RADIOWAVE RADIATION -- TRANSMISSION
Descriptors: COMMUNICATIONS; DISTURBANCES; GEOMAGNETIC EQUATOR; GHZ RANGE
01-100; INTERACTIONS; IONIZATION; MHZ RANGE; PACIFIC OCEAN; PERU;
SCINTILLATIONS; SEASONAL VARIATIONS
Broader Terms: EARTH ATMOSPHERE; ELECTROMAGNETIC RADIATION; FREQUENCY RANGE
; GHZ RANGE; IONOSPHERE; LATIN AMERICA; PLANETARY IONOSPHERES;
RADIATIONS; SEAS; SOUTH AMERICA; SURFACE WATERS; VARIATIONS
Subject Categories: 640201*
-- Atmospheric Physics -- Auroral,
Ionospheric, & Magetospheric Phenomena
10/5/920
00584460
Author(s):
(Item 620 from file:
BRA-05-009254;
Bowen, V.T.
103)
INS-80-002665;
EDB-80-023982
Title: Radioelement studies in the oceans.
1-December 31, 1978
Corporate Source:
Publication Date:
Progress report,
Woods Hole Oceanographic Institution, MA (USA)
Jan 1979
p 13
Report Number(s):
C00-3563-80
Contract Number (DOE): EY-76-S-02-3565
Document Type:
Report
Language: English
January
Journal Announcement:
EDB8002
Availability: Dep. NTIS, PC A02/MF AOl.
9808 036