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We study the temporal evolution of coronal loops using data from the SolarX-ray Imager (SXI) on board of GOES-12. This instrument allows us to follow indetail the full lifetime of coronal loops. The observed light curves suggestthree somewhat distinct evolutionary phases: rise, main, and decay. Thedurations and characteristic timescales of these phases are much longer than acooling time and indicate that the loop-averaged heating rate increases slowly,reaches a maintenance level, and then decreases slowly. This suggests that asingle heating mechanism operates for the entire lifetime of the loop. Formonolithic loops, the loop-averaged heating rate is the intrinsic energyrelease rate of the heating mechanism. For loops that are bundles ofimpulsively heated strands, it is an indication of the frequency of occurrenceof individual heating events, or nanoflares. We show that the timescale of theloop-averaged heating rate is proportional to the timescale of the observedintensity variation. The ratios of the radiative to conductive cooling times inthe loops are somewhat less than 1, putting them intermediate between thevalues measured previously for hotter and cooler loops. Our results providefurther support for the existence of a trend suggesting that all loops areheated by the same mechanism, or that different mechanisms have fundamentalsimilarities (e.g., are all impulsive or are all steady with similar rates ofheating).Comment: Accepted for publication in Ap

The Temporal Evolution of Coronal Loops Observed byGOESSXI