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We report kinematic shift and strength variability of C IV broad absorptionline (BAL) trough in two high-ionization X-ray bright QSOs SDSS J085551+375752(at zem ~ 1.936) and SDSS J091127+055054 (at zem ~ 2.793). Both these QSOs haveshown combination of profile shift, appearance and disappearance of absorptioncomponents belonging to a single BAL trough. The observed average kinematicshift of whole BAL profile resulted in an average deceleration of ~ -0.7 +-0.1, -2.0 +- 0.1 cm/s^2 over a rest-frame time-span of 3.11 yr and 2.34 yr forSDSS J085551+375752 and SDSS J091127+055054, respectively. To our knowledge,these are the largest kinematic shifts exceeding by factor of about 2.8, 7.8than the highest deceleration reported in the literature; making both of themas a potential candidate to investigate outflows using multi-wavelengthmonitoring for their line and continuum variability. We explore variouspossible mechanisms to understand the observed profile variations. Outflowmodels involving many small self-shielded clouds moving probably in a curvedpath provides the simplest explanation for the C IV BAL strength and velocityvariations along with the X-ray bright nature of these sources.

C IV absorption line variability in X-ray bright BALQSOs