The Galactic center region near l≈ 0.2 hosts a mixture of nonthermal linear filaments and thermal radio continuum features associated with the radio Arc. Chandra observations of this region reveal an X-ray filament and diffuse emission with an extent of roughly 60′′ × 2′′ and 5′ × 3′, respectively. The X-ray filament lies at the edge of the nonthermal radio filaments and a dense molecular shell...

We compare observations of the modulated intensities and spectra of galactic cosmic ray nuclei and anomalous heliumabove 30MeV/nmeasured by theCOsmic andSolar Particle INvestigations (COSPIN) High Energy Telescope (HET) on Ulysses with similar observations from the IMP-8 earthorbiting satellite between September 1994 and August 1995. During this interval Ulysses made a rapid scan of solar latit...

Extragalactic cosmic ray protons with an injection spectrum of the typeE show a spectrum on earth with a dip due to the Bethe-Heitler pair production against the photons of the cosmic microwave background. The dip is produced in the energy region 10 − 4 × 10 eV with position and shape that reproduce with high accuracy the spectrum observed experimentally. This interpretation of the observed dat...