eCite Digital Repository

The Influence of Cosmic-Ray Modulation at High Heliospheric Latitudes on the Solar Diurnal Variation Observed at Earth

Citation

Moraal, H and Caballero-Lopez, RA and McCracken, KG and Humble, JE, The Influence of Cosmic-Ray Modulation at High Heliospheric Latitudes on the Solar Diurnal Variation Observed at Earth, The Astrophysical Journal, 629, (1) pp. 556-560. ISSN 0004-637X (2005) [Refereed Article]

DOI: doi:10.1086/431480

Abstract

During the solar minimum period of 1954 the cosmic-ray diurnal variation as observed by neutron monitors and muon telescopes underwent a dramatic swing in its direction of maximum intensity, from the normal value between 16:00 and 18:00 local time to as early as 08:00. It is shown that this swing can be explained as being due to a negative radial density gradient of cosmic rays in the inner heliosphere and that this negative gradient is caused by large radial and latitudinal diffusion mean free paths that bring in particles from high latitudes. In principle, such large diffusion mean free paths should simultaneously cause high intensities, as were observed in 1954. © 2005. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:High Energy Astrophysics; Cosmic Rays
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Humble, JE (Dr John Humble)
ID Code:36283
Year Published:2005
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2005-08-01
Last Modified:2006-03-29
Downloads:0

Repository Staff Only: item control page