J. Space Weather Space Clim.
Volume 3, 2013
EU-FP7 funded space weather projects
|Number of page(s)||17|
|Published online||07 March 2013|
The first SEPServer event catalogue ~68-MeV solar proton events observed at 1 AU in 1996–2010
Department of Physics, University of Helsinki, 00014 Helsinki, Finland
2 Department of Physics and Astronomy, University of Turku, 20014 Finland
3 Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany
4 Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, 11810 Athens, Greece
5 CNRS-LESIA, Observatoire de Paris, Meudon, France
6 Dept. d’Astronomia i Meteorologia & Institut de Ciències del Cosmos, Universitat de Barcelona, Spain
7 Solar Physics Group, Leibniz Institut für Astrophysik Potsdam, Germany
8 Lehrstuhl für Astronomie, Julius-Maximilians Universität, Würzburg, Germany
9 CSNSM Orsay, CNRS-IN2P3 et Université Paris-Sud, 91400 Orsay, France
10 DH Consultancy BVBA, Leuven, Belgium
11 Department of Physics, Section of Astrogeophysics, University of Ioannina, Greece
12 Sodankylä Geophysical Observatory, Oulu Unit, University of Oulu, Finland
* Corresponding author: e-mail: firstname.lastname@example.org
Accepted: 13 February 2013
SEPServer is a three-year collaborative project funded by the seventh framework programme (FP7-SPACE) of the European Union. The objective of the project is to provide access to state-of-the-art observations and analysis tools for the scientific community on solar energetic particle (SEP) events and related electromagnetic (EM) emissions. The project will eventually lead to better understanding of the particle acceleration and transport processes at the Sun and in the inner heliosphere. These processes lead to SEP events that form one of the key elements of space weather. In this paper we present the first results from the systematic analysis work performed on the following datasets: SOHO/ERNE, SOHO/EPHIN, ACE/EPAM, Wind/WAVES and GOES X-rays. A catalogue of SEP events at 1 AU, with complete coverage over solar cycle 23, based on high-energy (~68-MeV) protons from SOHO/ERNE and electron recordings of the events by SOHO/EPHIN and ACE/EPAM are presented. A total of 115 energetic particle events have been identified and analysed using velocity dispersion analysis (VDA) for protons and time-shifting analysis (TSA) for electrons and protons in order to infer the SEP release times at the Sun. EM observations during the times of the SEP event onset have been gathered and compared to the release time estimates of particles. Data from those events that occurred during the European day-time, i.e., those that also have observations from ground-based observatories included in SEPServer, are listed and a preliminary analysis of their associations is presented. We find that VDA results for protons can be a useful tool for the analysis of proton release times, but if the derived proton path length is out of a range of 1 AU < s ≲ 3 AU, the result of the analysis may be compromised, as indicated by the anti-correlation of the derived path length and release time delay from the associated X-ray flare. The average path length derived from VDA is about 1.9 times the nominal length of the spiral magnetic field line. This implies that the path length of first-arriving MeV to deka-MeV protons is affected by interplanetary scattering. TSA of near-relativistic electrons results in a release time that shows significant scatter with respect to the EM emissions but with a trend of being delayed more with increasing distance between the flare and the nominal footpoint of the Earth-connected field line.
Key words: SEP / radiation / flares / radio emissions (dynamic) / projects
© R. Vainio et al., Published by EDP Sciences 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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