We have collected a sample of 70 BL Lacs (33 radio-selected BL Lacs and 37 X-ray selected BL Lacs) with multi-waveband data for investigating the classifying cr
Kinematic properties of coronal mass ejections (CMEs) suffer from projection effects,and it is expected that the real velocity should be larger and the real ang
Comparison of appropriate theoretically derived line ratios with observational data can yield estimates of a plasma’s physical parameters,such as electron dens