Results 271 to 280 of about 166,601 (310)

Transmission Electron Microscopy and Nano‐Precipitation

Advanced Engineering Materials, 2006
AbstractWe have presented here a rapid survey of some of the stringent results obtained by TEM and associated techniques in the precipitation studies conducted during the CPR ‘Précipitation'. It clearly appears that TEM plays an irreplaceable role in the link between the understanding of the structure and chemistry of small precipitates and the ...
openaire   +2 more sources

Bremsstrahlwung produced by precipitating electrons

Journal of Geophysical Research: Space Physics, 1979
Theoretical values are presented of the bremsstrahlung flux escaping the atmosphere for various incident electron fluxes. The assumed incident electron fluxes were isotropic with exponential energy spectra. The escaping bremsstrahlung intensity, energy spectra, and angular distributions depend on the incident electron flux characteristics, indicating ...
M. Walt, L. L. Newkirk, W. E. Francis
openaire   +1 more source

Patterns of magnetospheric electron precipitation

Journal of Atmospheric and Terrestrial Physics, 1967
Using an idealised magnetospheric-ionospheric circuit between conjugate points, a determination has been made of the relative, world-wide precipitation of magnetospheric electrons into the lower, denser atmosphere. The precipitation considered is that due to the superposition of a longitudinal electric field along the direction of the magnetic field ...
openaire   +3 more sources

Electron Microburst Precipitation in Earth’s Magnetosphere

2021 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2021
Intense bursts of precipitating electrons called "microbursts" were first detected in the 10-100 keV energy range using balloon-based instrumentation [ Anderson and Milton, 1964 ]. The balloon-borne detectors measure bremsstrahlung x-rays produced by energetic electrons that are scattered into Earth’s atmosphere from the Van Allen radiation belts ...
Robyn M. Millan, John G. Sample, T. Sotirelis, L. A Woodger, Arlo Johnson, Daniel E. Westphal, Kelly A. Cantwell   +6 more
openaire   +1 more source

Electron precipitation in the radiation belts

Journal of Geophysical Research, 1968
Fluxes and energy spectra are presented for electrons above an energy of ∼0.4 Mev on a worldwide basis over the range of L values 1.6–7, as measured in the fall of 1963 on a low-altitude polar-orbiting satellite. The data have been subjected to a systematic analysis in terms of the longitude variations in intensity and spectral shape.
openaire   +1 more source

Electron Precipitation at an Auroral Latitude – Saskatoon, L = 4.4. II. Fluxes of Precipitating Electrons

Canadian Journal of Physics, 1974
Measurements of ambient electron densities have been made by the differential absorption experiment, on a number of aurorally disturbed nights in 1971. The measured values of the intensity of the green line (5577 Å) emission, and of the ambient electron densities, are then compared with theoretical estimates of these two variables.
A. H. Manson, Z. M. Khan
openaire   +1 more source

Measurements of inner zone electron precipitation

Journal of Geophysical Research: Space Physics, 1980
Energetic electron (≳0.16 MeV) data taken from November 1972 to April 1973 from over 1000 passes of a low‐altitude (∼750 km) noon‐midnight polar‐orbiting satellite across the L=1.75 field line in both the northern and southern hemispheres have been analyzed for evidence of the longitude and local time distributions in electron precipitation on that ...
W.L. Imhof, J.B. Reagan, E.E. Gaines
openaire   +1 more source

Electron precipitation patterns and substorm morphology

Journal of Geophysical Research, 1973
Patterns of the precipitation of low energy electrons observed by polar satellites were examined as functions of substorm phase. Precipitation boundaries are generally identifiable at the low latitude edge of polar cusp electron precipitation and at the poleward edge of precipitation in the premidnight sector.
R. A. Hoffman, J. L. Burch
openaire   +1 more source

Precipitation of electrons after geomagnetic substorms

Studia Geophysica et Geodaetica, 1988
Precipitating electrons Ee>10 keV and Ee>30 keV and protons Ep=150 to 300 keV are analyzed using data obtained from the low-altitude polar-orbiting satellite Interkozmos-17 after the magnetic storm of December 2, 1977. On December 3, an isolated substrom occurred, and strong electron precipitation was observed in the midnigt sector, while the sequence ...
Yu. V. Gotselyuk, M. S. Kazaryan, S. N. Kuznetsov, Karel Kudela, Ivan Kimák   +4 more
openaire   +1 more source

Electron precipitations and polar auroras

Space Science Reviews, 1978
In the first part (Sections I–III) a brief historical review of the progress of our knowledge of the precipitation of auroral electrons is given. Observations by different techniques, in terms of detectors aboard balloons, sounding rockets, and polar-orbiting satellites, are reviewed (Sections I).
openaire   +1 more source