... 10^4 K - 10^6 K, measured from high spectral resolution data for several solar features observed at the limb by the High Resolution Telescope and Spectrograph (HRTS), including a coronalhole, quiescent regions' and several small scale active regions ...
... Two examples of explosive events observed with SUMER in transition region spectal lines are reported here; one detected in C IV 1548 AA, in a region within the northern polar coronalhole, and the other in O VI 1032 AA, in an active region. ...
... We present observations of O VI 1032 A line profiles obtained with the SUMER instrument on SOHO extending from the solar disk to 1.5 R_/odot above the limb in the north polar coronalhole. ...
... A study of an active region-coronalhole (AR-CH) boundary by Van Driel-Gesztelyi et ... will push its way into the coronalhole region where it initiates compression waves ...
... O v estimates in Table I P'erez et al. (1999) measured the temporal variation of electron den sity in an active region, a coronalhole and in the quiet Sun using the O iv lines of 1399 and 1401 љ A. They found that the average density in the coronalhole ...
... The data were obtained in a polar region during a period when the coronalholes at the poles were ill-defined. ... 1998) have shown that the nonthermal velocity above a polar coronalhole, as measured from the Si VIII line in SUMER spectra ...