Measurements of trapped electron intensities made by the Explorer XV satellite.
Spatial distribution of trapped particles measured by Explorer XV satellite, noting decay time constants and energies
TRAPPED PARTICLE↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The radiation belts, natural and artificial
Explorer xv satellite observations of natural and artificial radiation belts
EXPLORER XV SATELLITE↗
THE RADIATION BELTS, NATURAL AND ARTIFICIAL
Explorer xv satellite observations on natural and artificial radiation belts around the earth
EXPLORER XV SATELLITE↗
Experiments on explorer xv, project serb, study on the enhanced radiation belts final report
Explorer XV satellite particle experiments to measure electron distribution and effects of injection of new electrons in trapped radiation belts by high altitude nuclear explosions
RADIATION BELT↗
Solar array regulations of Explorer satellites XII, XIV, XV, XVIII, XXI, XXVI, XXVIII, and Ariel I
Differences in design of Explorer and Ariel I satellites solar array regulators for accommodating requirements of nickel-cadmium and silver-cadmium batteries
SOLAR CELL↗
Low energy trapped protons and electrons.
Explorer satellite XII, XIV and XV MEASUREMENTS, noting directional intensity energy flux, spatial distribution and spectra of low energy trapped protons and electrons
EXPLORER XII SATELLITE↗
Solar irradiance variations. II - Analysis of the extreme ultraviolet measurements onboard the Atmosphere Explorer E satellite
Five of the extreme ultraviolet channels (L-alpha, L-beta, He I, He II, Fe XV) measuring irradiance fluctuations on board the AE-E satellite between 1977 and 1980 have been studied in detail. It is shown that the daily variations correspond very closely to the daily variations in solar radio emission (F10.7), but that the UV data are afflicted with serious and to date unrecognized calibration changes during the period of operation of the instruments. In order to correct for these changes, a statistical analysis is carried out, and a set of corrections to the raw data is suggested. The resulting, now uniform, data are then compared with rocket measurements (L-alpha) and data acquired onboard the AE-C satellite (L-beta). Finally the remaining discrepancies are discussed. After concluding that they are below the overall level of uncertainties, a first-order 10-year run of EUV irradiances derived from F10.7 data is proposed. This estimate includes the ratio of irradiance levels between the maxima of solar cycles 20 and 21 and the intervening minimum.
Oster, L.↗
Helium-Like X-Ray Line Complexes Show That the Hottest Plasma on the O Supergiant ζPuppis Is in Its Wind
We present an analysis of Chandra grating spectra of k ey helium-lik e line comple x es to put constraints on the location with respect to the photosphere of the hottest ( T 6 ×10 6 K) plasma in the wind of the O supergiant ζPup and to explore changes in the 18 yr between two sets of observations of this star. We fit two models –one empirical and one wind-shock-based –to the S XV , Si XIII , and Mg XI line comple x es and show that an origin in the wind flow, abo v e r ≈1.5 R ∗, is strongly fa v oured o v er an origin less than 0.3 R ∗abo v e the photosphere ( r 1.3 R ∗), especially in the more recent, very long-exposure data set. There is a modest increase in the line and continuum fluxes, line widths, wind absorption signatures, and of the hot plasma’s distance from the photosphere in the 18 yr since the first Chandra grating observation of ζPup. Both modes of modelling include the effects of dielectronic recombination satellite emission line blending on the helium-like comple x es –the first time this has been accounted for in the analysis of He-like line ratios in O stars.
Maurice A Leutenegger↗