(the following information provided by Dr. Pierre Chayer)
Upon re-observation of the RSCVn star UX Ari on 19-22 Nov, the star was discovered to be in an extreme flaring state. It had brightened by a factor of ten over the observations obtained just 10 days earlier.
This event was not only the brightest RSCVn flare seen by EUVE, but also the largest such relative increase in source brightness for a RSCVn star ever measured by EUVE. In reviewing the status prompter information sent by CEA, the GO -- Dr. Andrea Dupree -- noticed the flare and immediately contacted the Project Office to request a Target of Opportunity (TOO) extension. This was approved and EUVE continued to observe UX Ari for an additional three days.
The flare was so strong and continuous that the star had not returned to normal at the end of the extension, but the EUV flux levels were at least factor of 3 above their quiescent value. Inspection of the quick-look spectra shows substantial increases in the strengths of the highest temperature species, Fe XXIII and Fe XIV.