Radial and latitudinal gradients of anomalous cosmic ray oxygen in the inner heliosphere
- Cummings, A. C.
- Tranquille, C.
- Marsden, R. G.
- Mewaldt, R. A.
- Stone, E. C.
Publication date
September 2009
DOI Publisher
American Geophysical Union (AGU) ISSN
0094-8276Abstract
We use data from the Ulysses, Advanced Composition Explorer, and Solar Terrestrial Relations Observatory spacecraft to determine the radial and latitudinal gradients of anomalous cosmic ray oxygen in two energy ranges from 4.5–15.6 MeV/nuc in the inner heliosphere for the first time during an A0. The latitudinal gradient is consistent with zero and in the range −0.3 to 0.4%/degree, suggesting that during A<0 these particles are not able to propagate into the inner heliosphere by rapid drift along the heliospheric current sheet if the tilt of the sheet is as large as 30 degrees
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