HR: 10:30h
AN: SP22A-01    [Abstracts]
TI: Dissertation Talk: Brightness and Magnetic Evolution of Solar Coronal Bright Points
AU: * Ugarte-Urra, I
EM: iuu@arm.ac.uk
AF: GMU/NRL, Naval Research Laboratory, Washington D.C., 20375 United States
AB: Dissertation: A study of the brightness and magnetic evolution of several Extreme ultraviolet (EUV) coronal bright points (hereafter BPs) using CDS, EIT, MDI (onboard SOHO) and TRACE is presented. The results confirm that, down to 1^" resolution, BPs are made of small loops with lengths of ~6 Mm and cross-sections of ~2 Mm. The loops are very dynamic, evolving in time scales as short as 1 -- 2 minutes. This is reflected in a highly variable EUV response with fluctuations highly correlated in spectral lines at transition region temperatures (in the range 3.2×10⁴ -- 3.5×10⁵ K). A wavelet analysis of the intensity variations reveals, for the first time, the existence of quasi-periodic oscillations with periods ranging 400--1000 s, in the range of periods characteristic of the chromospheric network. The link between BPs and network bright points is discussed. Co-spatial and co-temporal TRACE and MDI images also reveal the signature of heating events that produce sudden EUV brightenings simultaneous to magnetic flux cancellations. This is interpreted in terms of magnetic reconnection events.
DE: 7509 Corona
DE: 7546 Transition region
DE: 7549 Ultraviolet emissions
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly