Computer Science – Learning
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0032789b&link_type=abstract
Technical Report, Raytheon STX Corp. Lanham, MD United States
Computer Science
Learning
Soho Mission, Very Large Array (Vla), Magnetic Signatures, Extreme Ultraviolet Radiation, Solar Corona, Solar Activity, Pixels, Microwave Emission, Field Of View, Solar Magnetic Field, Solar X-Rays
Scientific paper
The purpose of this project is to apply the coronal magnetographic technique to SOHO (Solar Heliospheric Observatory) /CDS (Coronal Diagnostic Spectrometer) EUV (Extreme Ultraviolet Radiation) and coordinated VLA microwave observations of solar active regions to derive the strength and structure of the coronal magnetic field. A CDS observing plan was developed for obtaining spectra needed to derive active region differential emission measures (DEMs) required for coronal magnetography. VLA observations were proposed and obtained. SOHO JOP 100 was developed, tested, approved, and implemented to obtain coordinated CDS (Coronal Diagnostic Spectrometer)/EIT (Ultraviolet Imaging Telescope)/ VLA (Very Large Array)/ TRACE (Transition Region and Coronal Explorer)/ SXT (Solar X Ray Telescope) observations of active regions on April 12, May 9, May 13, and May 23. Analysis of all four data sets began, with heaviest concentration on COS data. It is found that 200-pixel (14 A in NIS1) wavelength windows are appropriate for extracting broadened Gaussian line profile fit parameters for lines including Fe XIV at 334.2, Fe XVI at 335.4, Fe XVI at 360.8, and Mg IX at 368.1 over the 4 arcmin by 4 arcmin CDS field of view. Extensive efforts were focused on learning and applying were focused on learning and applying CDS software, and including it in new IDL procedures to carry out calculations relating to coronal magnetography. An important step is to extract Gaussian profile fits to all the lines needed to derive the DEM in each spatial pixel of any given active region. The standard CDS absolute intensity calibration software was applied to derived intensity images, revealing that ratios between density-insensitive lines like Fe XVI 360.8/335.4 yield good agreement with theory. However, the resulting absolute intensities of those lines are very high, indicating that revisions to the CDS absolute intensity calibrations remain to be included in the CDS software, an essential step to deriving reliable coronal magnetograms. With lessons learned and high quality data obtained during the past year, coronal magnetography will be successfully pursued under my new SOHO GI program.
No associations
LandOfFree
Coronal Magnetography of Solar Active Regions Using Coordinated SOHO/CDS and VLA Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coronal Magnetography of Solar Active Regions Using Coordinated SOHO/CDS and VLA Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal Magnetography of Solar Active Regions Using Coordinated SOHO/CDS and VLA Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1277737