Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3969h&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
2
Scientific paper
The standard method to calculate spatial intensity gradients of energetic particles in the heliosphere is the "non-local" gradient (NLG) method [3], which requires observations from at least three spacecraft to simultaneously determine radial (gr ) and latitudinal (gλ ) gradients. We present a novel technique to calculate "quasi-local" gradients (QLG) [1] and apply the method to anomalous cosmic ray (ACR) ions during the 1994-1999 recovery phase. Under the prevailing conditions, the QLG method requires fewer than three spacecraft to determine gr and gλ . We briefly compare some assumptions, strengths, and weaknesses of the QLG and NLG methods. We use QLG with Voyager 1 & 2 (V1 & V2) Low Energy Charged Particle (LECP) measurements [2] to determine ACR gradients, which agree well with both a phenomenological ACR intensity model and a numerical, time-dep endent solution to the Fokker-Planck equation [1]. A principle result is the unexp ected determination of gλ < 0 for ACRs having rigidities less than ˜ 2 GV during the positive heliomagnetic polarity.
Hamilton Douglas C.
Hill Matthew E.
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