Results 251 to 260 of about 109,612 (300)
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Nature, 1979
Several decades of observations have failed to resolve the problem of the interpretation of extended extragalactic radio sources1,2. Most current models invoke the ejection of pairs of plasmoids or relativistic electron beams from the parent elliptical galaxy by various mechanisms3–5. As these theories generally predict the relative orientations of the
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Several decades of observations have failed to resolve the problem of the interpretation of extended extragalactic radio sources1,2. Most current models invoke the ejection of pairs of plasmoids or relativistic electron beams from the parent elliptical galaxy by various mechanisms3–5. As these theories generally predict the relative orientations of the
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2015
Abstract : The Earths inner and outer radiation belts, comprising energetic electrons and protons, pose a hazard to DoD spacecraft. Air ForceResearch Laboratory (AFRL) has an ongoing research effort to model and forecast the configurations of the belts, and to develop protective technologies for spacecraft.
Michael Starks +3 more
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Abstract : The Earths inner and outer radiation belts, comprising energetic electrons and protons, pose a hazard to DoD spacecraft. Air ForceResearch Laboratory (AFRL) has an ongoing research effort to model and forecast the configurations of the belts, and to develop protective technologies for spacecraft.
Michael Starks +3 more
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Nature, 1970
Dynamics of Geomagnetically Trapped Radiation By J. G. Roederer. (Physics and Chemistry in Space, Vol. 2.) Pp. xiv + 166. (Springer-Verlag: Berlin and New York, 1970.) 36 DM; $9.90.
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Dynamics of Geomagnetically Trapped Radiation By J. G. Roederer. (Physics and Chemistry in Space, Vol. 2.) Pp. xiv + 166. (Springer-Verlag: Berlin and New York, 1970.) 36 DM; $9.90.
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Space Science Reviews, 2001
Electron radiation belts can change dramatically in a few seconds or slowly over years. Important issues in understanding such changes are: (1) What is the source of electrons in the radiation belts? (2) How important is radial diffusion compared to other radial transport mechanisms?
Xinlin Li, Michael A. Temerin
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Electron radiation belts can change dramatically in a few seconds or slowly over years. Important issues in understanding such changes are: (1) What is the source of electrons in the radiation belts? (2) How important is radial diffusion compared to other radial transport mechanisms?
Xinlin Li, Michael A. Temerin
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Reviews of Geophysics, 1982
This paper reviews the status of radiation belt science at the close of the data acquisition phase (1976–1979) of the International Magnetospheric Study. The purpose is to place recent discoveries in context with respect to long‐standing problems and to indicate possible directions for future research in radiation belt physics.
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This paper reviews the status of radiation belt science at the close of the data acquisition phase (1976–1979) of the International Magnetospheric Study. The purpose is to place recent discoveries in context with respect to long‐standing problems and to indicate possible directions for future research in radiation belt physics.
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2005
The space radiation environment presents serious challenges to spacecraft design and operations: adding costs or compromising capability. Our understanding of radiation belt dynamics has changed dramatically as a result of new observations. Relativistic electron fluxes change rapidly, on time scales less than a day, in response to geomagnetic activity.
Geoffrey D. Reeves +9 more
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The space radiation environment presents serious challenges to spacecraft design and operations: adding costs or compromising capability. Our understanding of radiation belt dynamics has changed dramatically as a result of new observations. Relativistic electron fluxes change rapidly, on time scales less than a day, in response to geomagnetic activity.
Geoffrey D. Reeves +9 more
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1982
Abstract : This report suggests that electrons trapped in a dipolar field can reproduce some of the observed distributions of emission from extended extragalactic radio sources if the electron pitch-angle distributions are sufficiently anisotropic.
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Abstract : This report suggests that electrons trapped in a dipolar field can reproduce some of the observed distributions of emission from extended extragalactic radio sources if the electron pitch-angle distributions are sufficiently anisotropic.
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Space Science Reviews, 1979
The recent close encounters of Pioneer-10 (December 1973) and Pioneer-11 (December 1974) with the planet Jupiter provided the first in situ observations of zenomagnetically trapped particle radiation. Such observations represented a major advance in planetary research.
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The recent close encounters of Pioneer-10 (December 1973) and Pioneer-11 (December 1974) with the planet Jupiter provided the first in situ observations of zenomagnetically trapped particle radiation. Such observations represented a major advance in planetary research.
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Radiation Physics and Chemistry, 1994
Abstract The Earth's radiation belts, formed by energetic electrons and ions (principally protons) trapped in the Earth's quasi-dipolar field, are reviewed. The magnitudes of particle energies and fluxes encountered make this a very severe environment in which to conduct space missions.
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Abstract The Earth's radiation belts, formed by energetic electrons and ions (principally protons) trapped in the Earth's quasi-dipolar field, are reviewed. The magnitudes of particle energies and fluxes encountered make this a very severe environment in which to conduct space missions.
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1974
Jupiter is a copious source of radiowaves having a wavelength of 3–75 cm. The radiation is 20% or so linearly polarized perpendicular to the planet rotation axis, does not vary much in intensity over the entire range of observed frequencies, and changes slowly in intensity over a time interval of the order of a few years.
D. B. Beard, J. L. Luthey
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Jupiter is a copious source of radiowaves having a wavelength of 3–75 cm. The radiation is 20% or so linearly polarized perpendicular to the planet rotation axis, does not vary much in intensity over the entire range of observed frequencies, and changes slowly in intensity over a time interval of the order of a few years.
D. B. Beard, J. L. Luthey
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