SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Motion of geomagnetically trapped particles is analyzed, using parameters as invariants of motion or as constants for all particles on a line of force
Geomagnetically trapped alpha particles from Injun IV satellite measurements
Geomagnetically trapped alpha particles intensity between 527 and 2502 km measured by satellite detector, noting energy/nucleon spectra form
Absolute intensities of geomagnetically trapped particles with explorer xiv
Long term variations in high energy geomagnetically trapped particles from satellite detector data
Computer program to calculate geomagnetically trapped particle shell model, drift rate, and bounce paths
Data from explorer xiv satellite concerning the absolute intensities of geomagnetically trapped particles and the outer boundary of the magnetosphere
Generation of invariant shells by charged particle motion in dipole fields
Effect of geomagnetic fluctuations on trapped particles
Alpha particle proton ratio of geomagnetic field from data from charged-particle telescope on OGO 1 satellite
Results of observations of geomagnetically trapped alpha particles over the energy range from 1.18 to 8 MeV performed with the aid of the Injun 5 polar-orbiting satellite during the period from September 1968 to May 1970. Following a presentation of a time history covering this entire period, a detailed analysis is made of the magnetically quiet period from Feb. 11 to 28, 1970. During this period the alpha particle fluxes and the intensity ratio of alpha particles to protons attained their lowest values in approximately 20 months; the alpha particle intensity versus L profile was most similar to the proton profile at the same energy per nucleon interval; the intensity ratio was nearly constant as a function of L in the same energy per nucleon representation, but rose sharply with L when computed in the same total energy interval; the variation of alpha particle intensity with B suggested a steep angular distribution at small equatorial pitch angles, while the intensity ratio showed little dependence on B; and the alpha particle spectral parameter showed a markedly different dependence on L from the equivalent one for protons.
Ring current-induced variations in geomagnetically trapped particle fluxes
Definitions and properties of magnetic coordinates B, L, K, R, lambda and A, discussing role of these parameters in study of geomagnetically trapped particles
Temporal intensity variations of geomagnetically trapped solar alpha particles from Injun 5 observations
Effect of resonant magnetic moment violation on geomagnetically trapped particles
Spatial distribution of trapped particles measured by Explorer XV satellite, noting decay time constants and energies
Magnetic coordinate definitions and relation to parameters of geomagnetically trapped particles
In order to facilitate bounce-averaged guiding center simulations of geomagnetically trapped particles, we express the kinetic energy of a particle with magnetic coordinates (L,phi) as an analytic function of the first two adiabatic invariants (M,J) and the L value of the field line. The magnetic field model is axisymmetric, consisting of a dipolar vector-B field plus a uniform southward magnetic field parallel to the dipole moment mu(sub E). This model magnetosphere is surrounded by a circular equatorial neutral line whose radius b is an adjustable parameter. Our formulation provides a computationally efficient method for tracing the bounce-averaged adiabatic motion (conserving all three invariants) and nonadiabatic transport (violating the third invariant while conserving the first two invariants) of geomagnetically trapped particles in the model magnetosphere.