vector_($mms1_hpca_moms_mms1_hpca_heplusplus_ion_bulk_velocity_GSM[0],$mms1_hpca_moms_mms1_hpca_heplusplus_ion_bulk_velocity_GSM[1],$mms1_hpca_moms_mms1_hpca_heplusplus_ion_bulk_velocity_GSM[2])