HR: 0830h
AN: SP51B-02    [Abstracts]
TI: Study of Small-Scale Dynamics in Coronal Holes and Quiet Regions from TRACE/BBSO Observations
AU: * Yamauchi, Y
EM: yohei.yamauchi@njit.edu
AF: CSTR/NJIT, University Heights, Newark, NJ 07102 United States
AU: Wang, H
EM: haimin@flare.njit.edu
AF: CSTR/NJIT, University Heights, Newark, NJ 07102 United States
AU: Moore, R L
EM: Ron.Moore@nasa.gov
AF: NASA/MSFC/NSSTC, 320 Sparkman Dr, Huntsville, AL 35812 United States
AB: We made high-spatial and temporal resolution TRACE UV/EUV observations of coronal holes and quiet regions in September 2004 jointly with BBSO Hα and magnetogram observations. From the observations, we study the dynamics, structure, and magnetic setting of small-scale explosive events such as microflares, macrospicules, and mini-filament eruptions, both in coronal holes and in quiet regions. These event are of interest because they may play an important role in coronal heating in these regions. These events are thought to result from explosions in fine-scale mixed-polarity magnetic fields in the network. However, even though the fine-scale magnetic structure of the network is expected to be essentially the same in both regions, coronal holes and quiet regions are quite different in that coronal holes show open field magnetic structure and are the source of fast solar wind while quiet regions have closed magnetic fields and are the source of slow solar wind. Study of small-scale dynamic events is important for solving the problem of coronal heating in the regions and for understanding whether the heating process is different in coronal holes than in quiet regions. We report on the time evolution of dynamics of these events in relation to the structure and evolution of the network magnetic flux at their footpoints. We also report whether any differences between the events in coronal holes and quiet regions are seen.
DE: 7507 Chromosphere
DE: 7511 Coronal holes
DE: 7524 Magnetic fields
DE: 7549 Ultraviolet emissions
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly