Enhancement of LASCO C1, C2 and C3 Coronargraph Images
Abstract
The Large Angle Spectrometric Coronagraph (LASCO) onboard SOHO provides unprecedented views of the solar corona since January 1996. During the past year we carried out a study of the morphology and dynamical evolution of various structures in the solar corona including coronal mass ejections, and polar jets. We highlight in this report two examples of our analysis of CMEs (from 1997 April 30 and 1997 February 23), and the results of our testing of the viability of an MHD model of expanding flux rope developed by Chen et al. (1997). We also highlight results from our ongoing study of the dynamical evolution of structures in the solar polar regions. Our study was focused on a series of three compact jets of material ejected on 1997 March 22 from a point near the north pole. The results show evidence for substantial deceleration. The estimated initial ejection velocity is slightly below the Sun's escape velocity of 619 km/s. We conclude that the dynamical evolution of these jets is different from that of coronal mass ejections, which generally show continuous acceleration below 3-4 R solar radius.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1998
- Accession Number
- ADA353071
Entities
People
- Brian E Wood
- Margarita Karovska
Organizations
- Harvard–Smithsonian Center for Astrophysics