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Publisher
- american astronomical society56
- iop publishing29
- uppsala universitet, institutet for rymdfysik, uppsalaavdelningen26
- italian space agcy, via politecn snc, i-00133 rome, italy.21
- univ alabama, ctr space plasma & aeron res, huntsville, al 35805 usa.20
- univ alabama, ctr space plasma & aeron res, huntsville, al 35805 usa.;univ alabama, dept space sci, huntsville, al 35805 usa.20
- univ calabria, inst atmospher pollut res, natl res council, i-87036 arcavacata di rende, italy.20
- natl inst astrophys, astrophys observ torino, via osservatorio 20, i-10025 pino torinese, italy.16
- univ florence, dept phys & astron, via giovanni sansone 1, i-50019 sesto fiorentino, italy.16