Computer Science
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ad...rept.....k&link_type=abstract
Technical Report, AD-A353071
Computer Science
Solar Corona, Solar Observatories, Onboard Equipment, Coronagraphs, Image Enhancement, Morphology, Evolution (Development), Stellar Evolution, Viability, Stellar Mass Ejection, Spectrometers, Solar Diameter, Polar Regions, Magnetohydrodynamics, Estimating, Escape Velocity, Ejection
Scientific paper
The Large Angle Spectrometric Coronagraph (LASCO) on board 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.
Karovska Margarita
Wood Brian
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