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AbstractUltraviolet spectroscopic observations of the RS CVn star II Peg in February 1983 show evidence for flare activity in greatly enhanced chromospheric and transition region emission lines. The total radiative losses from the chromosphere and transition region (i.e. the temperature interval 4.0 ≤ log Te ≤ 5.4) during the flare is 3.1 1035 erg. Over the whole atmosphere (i.e. the temperature interval 4.0 ≤ log Te ≤ 8.0), we estimate total radiative losses of 2.4 1036 erg, (excludingdoi:10.1017/s0252921100153941 fatcat:caedk5hx6ncozasw3n2abwaceq