NMDB Meeting 2025: Cosmic Ray studies with Neutron Detectors

Session

Cosmic Rays in the Heliosphere

19 Mar 2025, 11:45

Seminar Room (Physics Department )

Description

Galactic cosmic rays are subjected to modulation when entering the heliosphere. An overview of these modulation processes along with computations with various modulation models provide useful information regarding the size and shape of the heliosphere, the local interstellar spectra at lower energies, the modulation in the heliosheath,

5. Observational evidence on the mechanism of relativistic particle acceleration in solar eruptions

Karl-Ludwig Klein (Observatoire de Paris)

19/03/2025, 11:45

Ground-level enhancements (GLE) designate eventS where relativistic protons and ions of solar origin trigger a cascade of secondary nucleons in the Earth’s atmosphere that can be detected on ground. GLEs require primary particles with energies of at least 430 MeV/nucleon, with a spectrum that may extend to several tens of GeV. They are extremes of solar particle acceleration, which pose...

3. Shape and extend of the solar wind transition surfaces: Solar Alfven and Sonic surfaces, the heliosphere and CR modulation

Xenophon Moussas (Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens)

19/03/2025, 12:35

We investigate the shape and extend of the solar wind transition surfaces, namely the slow (sonic), the fast magnetosonic and the Alven surface, as a function of heliospheric latitude using actual experimental data from Ulysses, Parker Solar Probe and Solar Orbiter pole to pole journey. We also derive the temporal variation of the radius of these surfaces using measurements from spacecraft at...