 |
| Titel |
Ulysses COSPIN observations of cosmic rays and solar energetic particles from the South Pole to the North Pole of the Sun during solar maximum |
| VerfasserIn |
R. B. McKibben, J. J. Connell, C. Lopate, M. Zhang, J. D. Anglin, A. Balogh, S. Dalla, T. R. Sanderson, R. G. Marsden, M. Y. Hofer, H. Kunow, A. Posner, B. Heber |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 6 ; Nr. 21, no. 6, S.1217-1228 |
| Datensatznummer |
250014632
|
| Publikation (Nr.) |
 copernicus.org/angeo-21-1217-2003.pdf |
|
|
|
|
|
| Zusammenfassung |
In 2000–2001 Ulysses
passed from the south to the north polar regions of the Sun in the inner
heliosphere, providing a snapshot of the latitudinal structure of cosmic ray
modulation and solar energetic particle populations during a period near solar
maximum. Observations from the COSPIN suite of energetic charged particle
telescopes show that latitude variations in the cosmic ray intensity in the
inner heliosphere are nearly non-existent near solar maximum, whereas small but
clear latitude gradients were observed during the similar phase of Ulysses’
orbit near the 1994–95 solar minimum. At proton energies above ~10 MeV and
extending up to >70 MeV, the intensities are often dominated by Solar
Energetic Particles (SEPs) accelerated near the Sun in association with intense
solar flares and large Coronal Mass Ejections (CMEs). At lower energies the
particle intensities are almost constantly enhanced above background, most
likely as a result of a mix of SEPs and particles accelerated by interplanetary
shocks. Simultaneous high-latitude Ulysses and near-Earth observations show
that most events that produce large flux increases near Earth also produce flux
increases at Ulysses, even at the highest latitudes attained. Particle
anisotropies during particle onsets at Ulysses are typically directed outwards
from the Sun, suggesting either acceleration extending to high latitudes or
efficient cross-field propagation somewhere inside the orbit of Ulysses. Both
cosmic ray and SEP observations are consistent with highly efficient transport
of energetic charged particles between the equatorial and polar regions and
across the mean interplanetary magnetic fields in the inner heliosphere.
Key words. Interplanetary physics
(cosmic rays) – Solar physics, astrophysics and astronomy (energetic
particles; flares and mass ejections) |
| |
|
| Teil von |
|
|
|
|
|
|
|
|