by SAIC, Science Applications International Corporation, National Aeronautics and Space Administration, National Technical Information Servic4e, distributor in Prospect, Tenn, [Washington, DC, Springfield, Va .
Written in English
|Statement||by T.W. Armstrong, B.L. Colborn.|
|Series||[NASA contractor report] -- NASA CR-193948., NASA contractor report -- NASA CR-193948.|
|Contributions||Colborn, B. L., United States. National Aeronautics and Space Administration.|
|The Physical Object|
The basic objective of the study was to evaluate the accuracy of present models and computational methods for defining the ionizing radiation environment for spacecraft in low Earth orbit (LEO) by making comparisons with radiation measurements made on the Long Duration Exposure Facility (LDEF) satellite, which was recovered after almost six years. The Earth Radiation Budget Satellite (ERBS) was a NASA scientific research satellite within NASA's ERBE (Earth Radiation Budget Experiment) Research Program - a three-satellite mission, designed to investigate the Earth 's radiation budget It also carried an instrument that studied stratospheric aerosol and gases.. ERBS was launched on October 5, by the Space Shuttle Challenger during the Operator: NASA. In January , the Long Duration Exposure Facility (LDEF), after five-and-one half years orbiting Earth, was retrieved during the STS space shuttle mission and returned to . 4. SUMMARY A detailed 3D mass model of the LDEF spacecraft and on board experiments was generated for ionizing radiation analyses. This model allows shielding effects to be accurately accounted for in predictions made to compare with LDEF radiation measure- ments and in related assessments of environment model by: 2.
LDEF (Long Duration Exposure Facility) In the early days of the spaceage, researchers recognized the potential of the planned Space Shuttle to deliver a payload to space, leave it there, and on a separate mission, retrieve the payload and return it to Earth for measurements. Get this from a library! LDEF satellite radiation analyses: final report, contract no. NAS [T W Armstrong; B L Colborn; United States. National Aeronautics and Space Administration.]. The exposure of human beings to ionizing radiation from natural sources is a continuing and inescapable feature of life on earth. A large number of natural radioactivity measurements were. radiation belt of the Earth." 3. Single event effects due to high-energy (> 10 MeV) protons and heavier ions generated, for example, in solar ﬂares and in coronal mass ejection (CME) shock fronts." 4. Total dosage effects caused by cumulative charged particle radiation received by spacecraft." 5.
Based on measurements of the impact craters on the LDEF satellite, the rate of accretion of cosmic dust on the present-day Earth is estimated to be 4 ± 2 × 10 10 g/yr (Love and Brownlee, ). A somewhat higher infall rate of 7 to 25 × 10 10 g/yr has recently been estimated from osmium isotopes (Sharma et al., ). Direct measurements of the flux of micrometeorites reaching Earth's. The purpose of the present contribution is to study in details the effects of antenna radiation reaction on the orbital elements of the Global Position System (GPS) satellite class BLOCK IIR in a MEO orbit, whose communication system operates with quadrifilar helix antenna arrays and, as a second case, the communication satellite INTELSAT Cited by: 3. LDEF was a cylindrical satellite, deployed into a low Earth orbit by Challenger mission STSC in April LDEF was returned to Earth aboard Columbia in January MISSE: The Materials International Space Station Experiment is an ongoing series of experiments that tests how samples and specimens react to exposure to the space environment. CCD Radiation Effects and Test Issues for Satellite Designers Review Draft Prepared by Cheryl J. Marshall (NASA-GSFC) and Paul W. Marshall (NASA-GSFC Multi-Engineering Disciplinary Support Contract Task ) 6 October, This work is sponsored by the NASA Electronic Parts and Packaging (NEPP).