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