Antwoord op mezelf: ja best wel betrouwbaar.
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1996SoPh..165..181H&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES
https://arxiv.org/ftp/arxiv/papers/1407/1407.3231.pdf