Speaker
Giuseppe Di Bernardo
Description
Fairly poor knowledge is still present about the cosmic ray (CR) spectra at low energies, due to the distortion produced by the solar wind on the particle fluxes. A self-consistent galactic plus solar propagation model turns out necessary in order to correctly reproduce the CR nuclear and lepton spectra.
For that, a detailed transport description in the galaxy has been numerically
implemented in a full three-dimensional code (DRAGON), to compute the local interstellar spectra (LIS) of several CR species.
Then, we propagate the charged particles in the heliosphere,
where charge-sign dependent motion effects are taken in account.
Going beyond the standard force-field solar modulation,
we are able to interpret the data available nowadays.
In particular the hadron and lepton spectra provided by observations at Earth,
from the PAMELA and AMS-02 missions.
In a multichannel analysis of cosmic ray electron and positron
spectra, we therefore study the diffuse synchrotron emission of the Galaxy.
Below 4 GeV, we find that the electron primary spectrum is significantly suppressed so that the low-energy total spectrum will turn out to be dominated by secondary particles.
Finally, we investigate the high latitude (|b| >10 deg) diffuse gamma-ray emission in the Galaxy in light of the recently published data from the Fermi-Lat Collaboration, at energies between 100 MeV and 100 GeV.
