There are two types of high-speed solar wind streams classified in two categories: coronal hole associated and flare generated streams. These two types of streams are classified in two categories based on magnetic field and solar wind plasma parameters. In the present work we have studied the characteristic of cosmic ray nucleonic intensity along with solar/geomagnetic parameters and their inte...

The Earth is continually exposed to the cosmic radiation of both solar and galactic origin. Solar eruption and solar activity may affect cosmic radiation flux density which has a secondary effect on the flux of particles in the atmosphere as well. Such one event was recorded in the last week of October 2003, where the measured dose rate of the cosmic radiation in the aircraft ATR 42 was 1.8 tim...

We show that recent γ-ray observations of the Small Magellanic Cloud with EGRET rule out a universal cosmic ray flux only at energies below ≈ 10 GeV, while the observed diffuse X-ray and γ-ray background radiations have already ruled out, by more than three orders of magnitude, a universal extragalactic cosmic ray flux identical to that observed in the local solar neighborhood at energies below...

We calculate the solar-modulated energy spectra of cosmic-ray antiprotons (¯ p's) from two candidate primary sources, i.e., evaporating primordial black holes and the annihilation of neutralino dark matter, as well as for the secondary ¯ p's produced by cosmic-ray interactions with interstellar gas. A large enhancement toward the solar minimum phase emerges in the low-energy flux of ¯ p's from ...

The energy spectrum of cosmic-ray antiprotons (p̄’s) has been measured by BESS successively in 1993, 1995, 1997 and 1998. In total, 848 p̄’s were clearly identified in energy range 0.18 to 4.20 GeV. From these successive measurements of the p̄ spectrum at various solar activity, we discuss about the effect of the solar modulation and the origin of cosmic-ray p̄’s. Measured p̄/p ratios were nearly id...

We study the inverse Compton scattering of solar photons by Galactic cosmic-ray electrons. We show that the γ-ray emission from this process is substantial with the maximum flux in the direction of the Sun; the angular distribution of the emission is broad. This previously-neglected foreground should be taken into account in studies of the diffuse Galactic and extragalactic γ-ray emission. Furt...

Ulysses, launched in October 1990, began its second out-of-ecliptic orbit in December 1997, and its second fast latitude scan in September 2000. In contrast to the first fast latitude scan in 1994/1995, during the second fast latitude scan solar activity was close to maximum. The solar magnetic field reversed its polarity around July 2000. While the first latitude scan mainly gave a snapshot of...

We analyse cosmic ray hits impacting the detector system of the Coronal Diagnostic Spectrometer aboard the Solar and Heliospheric Observatory spacecraft. These observations allow us to study the modulation of cosmic rays over a 4 year period (1996-2000) running from solar minimum to maximum, from a Sun-Earth L1 Lagrangian orbit. The modulation, at the 45-50% level is consistent with cosmic rays...

Aims. A model to describe cosmic ray spectra in the energy region from 10 11 up to 10 17 eV is suggested. It bases on the preposition that Galactic cosmic ray flux is a mixture of fluxes, accelerated by shocks from nova and supernova explosions of different types. Methods. We analyze recent experimental data on cosmic ray spectra obtained in direct measurements above the atmosphere and data obt...

Aims. A model to describe cosmic ray spectra in the energy region from 10 10 to 10 17 eV is suggested based on the assumption that Galactic cosmic ray flux is a mixture of fluxes accelerated by shocks from nova and supernova of different types. Methods. We analyze recent experimental data on cosmic ray spectra obtained in direct measurements above the atmosphere and data obtained with ground Ex...