An Erupting Active Region Filament: Three-Dimensional Trajectory and Hydrogen Column Density

摘要: From 15:33 through 16:02 UT on 13 June 1998, observations of an erupting filament as it crossed solar disk center were obtained with the NSO/KPVT and SOHO/CDS instruments part SOHO Joint Observing Program 70. Context show that this event was eruption north-east section a small active region associated NOAA 8237, photospheric magnetic field changing in between 12–14 coronal Moreton-wave occurred, well white-light CME off south-west limb. The imaging spectroscopy data covered 512 × arc sec spectrally centered at He i 1083 nm line captured ± 1.0 surrounding spectrum. absorption is seen blue-shifted to velocities 200 300 km s−1. true trajectory by using projected coordinates integrating Doppler velocity. travels total velocity about s−1 along path inclined roughly 49 deg surface rises height just over 1.5 radii before becomes too diffuse follow. also shows internal motions multiple components shifted 25 Finally, KPVT no Stokes V profiles Doppler-shifted 1083.03 limit 3×10−3 times continuum intensity. scanned FOV seven EUV lines; emission lines from 58.4 nm, ii 30.4 O iv 55.5 v 63.0 Ne vi 56.3 Mg x 61.0 representing temperatures 2×104K 1×106K. Bound-free H i, without confusion foreground emission, obscures underlying chromospheric emission. A fit wavelength dependence five yields column density ξH I =4.8±2.5×1017 cm−2. Spatial maps more confined than regions which