SOHO/UVCS observations

SOHO/UVCS CME watch program in support of the Sigmoid JOP 106 during the WSM III Campaign:

Position Angle: 292 degrees
Heights: 1.7 Ro, 2.3 Ro, 2.6 Ro
Exposure time: 1.7 Ro: 1000 sec

2.3 Ro:  300 sec
2.6 Ro:  200 sec
Observation sequence: repeating the (1.7 Ro, 2.3 Ro, 2.6 Ro) sequence
Major Lines: Lyman Alpha 1216 A
Lyman Beta  1025 A
O V]        1218 A
O VI        1032 A, 1037 A
Si XII       499 A
N III        989 A, 991 A
C III        977 A
Mg X         609 A


A brief, preliminery description of the SOHO/UVCS observations on the west limb jet/CME on Aug. 26, 1999:

SOHO/UVCS caught a CME at the NW limb during the sigmoid JOP106 on Aug.26 from 21:37 UT to 23:15 UT at 1.7 Ro. It is still not clear right now if this CME comes from the active regions where the sigmoid resides. A preliminary look at the data shows brightening at Lyman Alpha, Lyman Beta, C III 977, N III doublets @989/991, OVI doublets @1032/1037 and  possibly O V] 1218. These lines were blue-shifted, then turned red-shifted. There is no obvious sign of CME-associated materials at 2.3 and 2.6 Ro.
 
CDS also observed a jet at 21:09 UT at the NW limb!

More details on the line shifts--

At 1.7 Ro, UVCS saw lines blue-shifted from 21:37 to 21:55, ~no shift from 22:06 to 22:24, red-shifted from 22:35 to 22:53, more red-shifted from 23:04 to 23:15. From the CDS data , O V 609 (and He I too) is  red-shifted @21:09, blue-shifted only at the base @ 21:34 and blue-shifted @21:59. The time sequence of the line shift seems correlate well with  ~30 minutes travelling time from the limb to 1.7 Ro, but the direction of  the line shift is reversed! Lyman alpha line is narrower than the background coronal Lyman alpha, not broadened as what is shown for O V of the CDS data.  Our O V] 1218 line seems brightened too, but we have to be careful to substract LyA grating ghost in our data.