Observations of energetic particles with EPAC on Ulysses in polar latitudes of the heliosphere View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-11

AUTHORS

E. Keppler, M. Fränz, M. K. Reuss, J. B. Blake, R. Seidel, J. J. Quenby

ABSTRACT

Measurements with the EPAC energetic-charged-particle instrument aboard Ulysses show between −15° and −65° ions and, to some extent, also electrons apparently accelerated by shocks associated with a cororating interaction region (CIR) operating at low latitudes. Particles could have reached Ulysses along magnetic-field lines which connect to the shocks in the more distant heliosphere. Such connections evidently do not exist above −65°. Between the recurrent streams we find the underlying composition to be similar to that of the anomalous component of cosmic rays (ACR). One channel (ELH), sensitive also to high-energy protons (E>210 MeV), shows that, superimposed to the large-scale heliospheric modulation of galactic ions, a 26-day variation of the flux is observed. Such modulation is also observed for the ACR, in phase with the galactic particle modulation, but anticorrelated to the CIR-related low-energy particles. An estimate of the latitudinal and radial gradients of the galactic cosmic rays at 1 GV gives +0.4%/degree and −11%/AU, respectively. More... »

PAGES

915-920

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02508131

DOI

http://dx.doi.org/10.1007/bf02508131

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011215754


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