SOT: HOP 31 Coronal Hole Boundary
2007-11-16T18:09:00 to 2007-11-17T00:04:00
Science Goal:
Program: Na IV,Ca,BC 2kx2k 2x2 (3min)
Target: Coronal Hole
xcen=774 ycen=-120
Instrument: SOT
HOP/JOP: 0
Description:
SCIENCE OBJECTIVE: We propose to study the sources of fast and slow solar wind by investigating how the flux tubes change from a high-speed to a low-speed region. We will select a polar hole with a clearly-defined streamer region nearby and study both regions and the boundary between the polar coronal hole and the surrounding quiet Sun region from the limb to UVCS heights. We aim to measure how the plasma physical properties change between the two wind regions, and with height, and how the flux tubes expand with heliocentric distance. In particular, this campaign will study the evolution of the transition from fast to slow wind source regions as a function of time and heliocentric distance from the limb and will provide important experimental constraints to theoretical models.
