Time-clustering behavior in the sequence of solar flare hard X-ray bursts from April 1991 to May 2000 obtained from BATSE/GRO (Burst and Transient Source Experiment aboard the Compton Gamma Ray Observatory satellite) was investigated by using the Allan Factor statistics. The presence of...

A sequence of aircraft accidents has been analyzed using an Internet freely available database. By means of the Allan Factor (AF) statistics, time-clustering phenomenon was detected in the sequence, and this indicates that at certain timescales the time dynamics of the events is not Poissonian...

Temporal regimes in fire data recorded from 1997 to 2003 in an area of central Italy have been detected by using the Allan Factor statistics. Our findings reveal the presence of meteo-climatic-related periodicities; furthermore time-scaling behaviour characterizes the point process of the fire...