EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Trattner et al. 1997
Trattner, K.J., Marsden, R.G. and Sanderson, T.R. (1997). The Ulysses north polar pass: Latitudinal gradients of anomalous cosmic ray O, N And Ne. Geophysical Research Letters 24: doi: 10.1029/97GL01747. issn: 0094-8276.

A key finding of the Ulysses mission has been the absence of large latitudinal gradients in the Anomalous Cosmic Ray (ACR) component. Studies using data from several satellites have consistently shown a small (~2%/deg.) positive latitudinal gradient for anomalous O, N and Ne in the energy range 4 to 30 MeV/n, and even smaller gradients for ACR He. In this paper we use data from the COSPIN/LET experiment on board Ulysses to investigate (a) the behaviour of the ACR latitudinal gradients during the passage over the northern polar regions, and (b) possible north-south asymmetries. The descent from the north pole has taken place under solar minimum conditions, providing a unique opportunity to study fully developed latitudinal effects. Our data survey covers three ACR species, O (4 to 20 MeV/n), N (4 to 20 MeV/n) and Ne (4 to 30 MeV/n). ACR gradients have been calculated for three different regions: 0¿--20¿ (~5%/deg.), 20¿--60¿ (~3%/deg.) and 60¿--80.2¿ (~1%/deg.). Comparison of data from the northern and southern hemisphere at a given latitude shows an asymmetry with higher fluxes in the north than in the south at a given latitude.¿ 1997 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Interplanetary Physics, Cosmic rays, Interplanetary Physics, Ejecta, driver gases, and magnetic clouds, Interplanetary Physics, Interstellar gas
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit