Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (24) (Citation History)
· Refereed Citations to the Article
· Associated Articles
· Reads History
·
· Translate This Page
Title:
The simulated features of heliospheric cosmic-ray modulation with a time-dependent drift model. II - On the energy dependence of the onset of new modulation in 1987
Authors:
Le Roux, J. A.; Potgieter, M. S.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt; Maryland, University, College Park), AB(NASA, Goddard Space Flight Center, Greenbelt; Maryland, University, College Park)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 661-667. Research supported by University of Maryland and Department of Environmental Affairs of the Republic of South Africa. (ApJ Homepage)
Publication Date:
05/1992
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Cosmic Rays, Heliosphere, Neutral Sheets, Solar Corpuscular Radiation, Radial Distribution, Stellar Models, Time Dependence
DOI:
10.1086/171317
Bibliographic Code:
1992ApJ...390..661L

Abstract

Time-dependent heliospheric cosmic-ray modulation for the period 1985-1989 is simulated by means of a time-dependent axially symmetric drift model with an emulated wavy heliospheric neutral sheet (HNS). The model is used to extend previous calculations to other energies in order to study a possible energy-dependence of the onset of new modulation at various radial distances in 1987. The model, with the outward propagating changes of the HNS as the only time-dependent parameters, is found to predict essentially no energy-dependence in the time when new modulation started in the simulated 1987. When a more practical approach in defining 'constant' modulation in 1987 is followed, the present calculations can be interpreted to indicate that the end of the recovery period in 1987 happened progressively earlier and the onset of new modulation progressively later the higher the rigidity of the cosmic rays. This period of relatively unchanged modulation is predicted to last longer with increasing radial distance.

Associated Articles

Part  1     Part  2     Part  3     Part  4    


Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints