  The analysis of a hot loop oscillation event using SOHO/SUMER, GOES/SXI, and
RHESSI observations is presented. Damped Doppler shift oscillations were
detected in the Fe XIX line by SUMER, and interpreted as a fundamental standing
slow mode. The evolution of soft X-ray emission from GOES/SXI and hard X-ray
sources from RHESSI suggests that the oscillations of a large loop are
triggered by a small flare, which may be produced by interaction (local
reconnection) of this large loop with a small loop at its footpoint. This study
provides clear evidence supporting our early conjecture that the slow-mode
standing waves in hot coronal loops are excited by impulsive heating (small or
microflares) at the loop's footpoint.
