Abstracts submitted by Andrzej Fludra
Characteristics of Small-Scale Transient Brightenings in the Transition Region
A. Fludra and D. Haigh
Space Science and Technology Department, Rutherford Appleton Laboratory, UK
We have developed a numerical method of detecting small-scale transient events in long, high-cadence time series. We use data recorded by the Coronal Diagnostic Spectrometer in the transition region line O V 629.7 A (~220,000 K) and analyse hundreds of hours of sit-and-stare time series obtained with a 15-s cadence in the quiet sun and active region areas. We derive event durations, rise and decay time, peak and total intensity, and obtain a continuous spectrum of their distributions for thousands of events, spanning a range from nanoflares to large brightenings (linear extent 2" - 10"), with durations between 60 s and 10 minutes, and the total intensity varying by two orders of magnitude. We discuss the implications of the derived parameter distributions for the understanding of the mechanism of the energy release in these events. This analysis uses a different method and a vastly larger amount of data than a previous CDS study, and offers better time resolution than other studies using EIT and TRACE images. |
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