Solar Energetic Particles (SEPs) on a heliospheric scale - an attempt to compile the complete Ulysses event list over solar cycle 23

Details Solar Energetic Particles (SEPs) on a heliospheric scale - an attempt to compile the complete Ulysses event list over solar cycle 23 Solar Energetic Particles (SEPs) on a heliospheric scale - an attempt to compile the complete Ulysses event list over solar cycle 23

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...12p&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

Physics

Scientific paper

The intensities of Solar Energetic Particles (SEPs) are strongly affected by the variations in the level of solar activity, the characteristics of the solar wind and the properties of the interplanetary magnetic field that enable the acceleration and propagation of SEPs throughout the heliosphere. The study of SEPs at different latitudes and under different heliospheric conditions provides useful information about the global structure of the heliosphere during solar minimum and solar maximum, as well as on the mechanisms and the physics of solar particle propagation and acceleration. Due to its eccentric orbit over the solar poles and its continuous presence in space for 18 years, Ulysses spacecraft has been the only solar mission so far that allowed us to study the characteristics of SEPs at low and high latitudes and their distribution over a solar cycle. In this work, the Heliosphere Instrument for Spectra, Composition and Anisotropy in Low-Energies (HI-SCALE) and the Low-Energy Telescope (LET) of the Cosmic Ray and Solar Particle Investigation (COSPIN) onboard Ulysses have been used in order to identify all SEPs observed in and out of the ecliptic plane over solar cycle 23. A scan has been performed on the recordings of the low-energy protons of COSPIN/LET (energy range: 0.9-8.0 MeV) and the Deflected Electrons (DEs) of HI-SCALE (energy range: 38-315 keV). As a result, a list of about 150 well-defined events has been compiled. A part of this list, together with the analysis of case studies is being discussed. Furthermore, ongoing work includes the single treatment of each event and the possible identification of its solar source which could also be used as the basis for future solar missions such as Solar Orbiter in which IAA/NOA participates as a Co-Investigator (EPD instrument).

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