With many thanks I refer to :
Carley Reid Vilmer Gallagher 2015, "Low frequency radio observations of bi-directional electron beams in the solar corona"
http://arxiv.org/abs/1508.01065
http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1508.01065
66 references at:
http://adsabs.harvard.edu/cgi-bin/nph-ref_query?bibcode=2015A%26A...581A.100C&refs=REFERENCES&db_key=AST
......