Accession Number : ADA263205


Title :   Quasi-Static Model for Outer Zone Electrons


Corporate Author : PHILLIPS LAB HANSCOM AFB MA


Personal Author(s) : Brautigam, D H ; Gussenhoven, M S ; Mullen, E G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263205.pdf


Report Date : Dec 1992


Pagination or Media Count : 8


Abstract : With the Combined Release and Radiation Effects Satellite (CRRES) measurements, we have observed an extremely variable outer zone relativistic electron population from 25 July 1990 to 12 October 1991. Up to now, this population has been modeled by the static NASA solar minimum and maximum models. To address the inadequacies of using a static model to describe this highly dynamic environment, we develop a quasi-static model of the outer zone electrons based on the readily available geomagnetic activity index, Ap. It is shown that certain quantities used to parameterize the electron belt morphology are moderately correlated with the logarithm of the 15-day average of Ap (Apl5). We therefore separate and average, as a function of Apl5, the 438 daily average radiation belt profiles (electron flux versus L) for each of 9 energy channels (1 - 8 MeV). The result is a set of average flux profiles which are keyed to geomagnetic activity. This quasi-static model provides a more accurate representation of the dynamic outer zone electron environment than could be expected from any static model....Quasi-Static, Electrons, Flux, Magnetosphere.


Descriptors :   *RELATIVISTIC ELECTRONS , *RADIATION BELTS , FUNCTIONS , REPRINTS , MEASUREMENT , SPACE ENVIRONMENTS , MODELS , DYNAMICS , QUANTITY , MORPHOLOGY , ENERGY , POPULATION , VARIABLES , PROFILES , ARTIFICIAL SATELLITES , RELEASE , INDEXES , ELECTRON FLUX , CHANNELS , RADIATION EFFECTS , MAGNETOSPHERE


Subject Categories : Astrophysics
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE