![](/images/icons/spacer.gif) |
Detailed Reference Information |
Webber, W.R., Heber, B. and Lockwood, J.A. (2005). Time variations of cosmic ray electrons and nuclei between 1978 and 2004: Evidence for charge-dependent modulation organized by changes in solar magnetic polarity and current sheet tilt. Journal of Geophysical Research 110: doi: 10.1029/2005JA011291. issn: 0148-0227. |
|
We have examined the 52-day average intensities of 1.2-GV electrons and positively charged nuclei of the same rigidity during the time period from 1978 to 2004. This time period covers a complete 22-year solar cycle plus data from 2000 to 2004 that can be used to examine the repetitive nature of the variations. The 11-year solar modulation changes both the electrons and nuclei intensities by similar overall factors ~10 at 1.2 GV. Differences in the electron/nuclei modulation as exhibited by the e/nuclei ratios occur mainly between 1980--1984, 1990--1994, and 2000--2004. At these times the e/nuclei ratios increase or decrease by a factor ~2 at 1.2 GV in close correspondence with the changes in solar magnetic polarity from positive to negative (1980) and negative to positive (1990). The e/nuclei ratio changes in 2000--2004 match those seen in 1980--1984, thus confirming the 22-year nature of the e/nuclei variations. |
|
![](/images/icons/spacer.gif) |
![](/images/icons/spacer.gif) |
BACKGROUND DATA FILES |
|
![](../images/icons/sq.gif) |
Abstract![](/images/icons/spacer.gif) |
|
![](../images/buttons/download.very.flat.gif) |
|
|
|
Keywords
Interplanetary Physics, Cosmic rays, Interplanetary Physics, Energetic particles, Interplanetary Physics, Solar cycle variations, Interplanetary Physics, Interplanetary magnetic fields, electrons, cosmic rays, solar cycle variations, solar magnetic polarity |
|
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 |
|
|
![](/images/icons/spacer.gif) |