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- uppsala universitet, institutet for rymdfysik, uppsalaavdelningen25
- oxford univ press17
- univ bern, phys inst, sidlerstr 5, ch-3012 bern, switzerland.15
- edp sciences13
- american association for the advancement of science12
- cnrs, lpc2e, f-45071 orleans, france.10
- goddard space flight ctr, heliophys div, 8800 greenbelt rd, greenbelt, md 20771 usa.10
- johns hopkins univ, appl phys lab, 11100 johns hopkins rd, laurel, md 20723 usa.10
- southwest res inst, div space sci & engn, 6220 culebra rd, san antonio, tx 78238 usa.10