1,269 research outputs found
Australian Psalms
Prewer, Bruce D. Australian Psalms. Adelaide: Lutheran Publishing House, 1979
Composition Measurements from ISEE-3: Fluorine through Calcium
Spacecraft measurements are reported of the elemental composition of galactic cosmic rays with 9 ≤ Z ≤ 5 ~20 at energies ~220 MeV /nucleon. In addition, for the elements with 16 ≤ Z ≤ 20 isotopic composition results are reported. The measured composition is found to be in generally good agreement with that expected from a propagated solar-like source
Evolution of suprathermal seed particle and solar energetic particle abundances
We report on a survey of the composition of solar-wind suprathermal tails and solar energetic particles (SEPs) including data from 1998 to 2010, with a focus on 2007 to 2010. The start of solar cycle 24 included several SEP events that were unusually He-poor. We conclude that these He-poor events are more likely related to Q/M-dependent spectral variations than to seed-particle composition changes. We also find that the quiet-time suprathermal Fe/O ratio during the 2008-2009 solar-minimum was dramatically lower (Fe/O ≤ 0.01) than earlier due in part to very low solar activity, but also suggesting contributions from an oxygen-rich source of suprathermal ions of unknown origin
The Space Physics Data System - Cosmic and Heliospheric Nodes
The Space Physics Data System (SPDS) is a community- driven network
of information sources, linked and interfaced by World Wide Web
software. The SPDS coordinators are community representatives to the
NASA Space Physics Division, who are soliciting additional Web nodes,
trying to keep the nodes organized, and soliciting information/suggestions
about older data in danger of loss. Here we present a guide to data in
Cosmic and Heliospheric nodes of the SPDS. New contributions to this
system are being solicited and some funds may be available to assist
with their development
Elemental and isotopic fractionation in 3He-rich solar energetic particle events
Using data from the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) mission, heavy ion composition measurements have been made in 26^3He-rich solar energetic particle (SEP) events that occurred between 1998 and 2004. Relative abundances of 13 elements from C through Ni have been investigated, as have the isotopic compositions of the elements Ne and Mg. We find a general tendency for the abundances to follow trends similar to those found in gradual SEP events, in which fractionation can be represented in the form of a power-law in Q/M. However several deviations from this pattern are noted that may provide useful diagnostics of the acceleration process occurring in solar flares
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