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Solar and Galactic Cosmic Rays Observed by SOHO
Curdt, W.; Fleck, B.
Both the Cosmic Ray Flux (CRF) and Solar Energetic Particles (SEPs) have left an imprint on SOHO technical systems. While the solar array efficiency degraded irreversibly down to ≈77% of its original level over roughly 1 1/2 solar cycles, Single Event Upsets (SEUs) in the solid state recorder (SSR) have been reversed by the memory protection mecha…
Simultaneous Analysis of Recurrent Jovian Electron Increases and Galactic Cosmic Ray Decreases
Fichtner, H.; Scherer, K.; Gómez-Herrero, R. +10 more
The transport environment for particles in the heliosphere, e.g. galactic cosmic rays (GCRs) and MeV electrons (including those originating from Jupiters magnetosphere), is defined by the solar wind flow and the structure of the embedded heliospheric magnetic field. Solar wind structures, such as co-rotating interaction regions (CIR), can result i…
Triangulation of CME Source Region Locations on the Sun and Dependence on Spacecraft Observation Angles
Temmer, M.; Hanslmeier, A.; Preiss, S.
STEREO-A, STEREO-B, and LASCO/SOHO observe coronal mass ejections (CMEs) from three different vantage points. On the basis of the radial plane-of-sky (POS) measurements of a CME in these three projection planes, the CME source region (SR) location was determined using the triangulation method of Temmeretal2009. As this triangulation method needs d…
(im)Balance of Forces in the Corona
Sylwester, B.; Sylwester, J.
Observed pattern of variability of solar atmosphere plasma structures, often accompanied by respective measured Doppler shifts, provides a direct evidence of imbalanced forces acting in this environment. Observed motions have been studied in various energy bands, extending from radio to hard X-rays using ground and space-borne instruments. Here, w…