Abstract The object of the Coronal Magnetic Structures Observing Campaign (CoMStOC) was to measure the electron density and the magnetic field strength in coronal loops, quantities which are poorly known but essential to the understanding of the solar corona. Simultaneous soft X-ray and microwave observations were taken by the Solar Maximum Mission's (SMM) X-Ray Polychromator (XRP) and the Very Large Array (VLA) on four days in the campaign period (25 Nov to 21 Dec 1987). Supporting multi-waveband observations were used to choose target regions, understand morphology, track evolution, and co-register images. XRP maps in soft X-ray resonance lines formed at different coronal temperatures provide accurate temperature and emission measure diagnostics. VLA maps at several frequencies in the 20 cm and 6 cm bands and Owens Valley spectra yield information on microwave structure, spectrum and polarization. The combined data set separates contributions from the two dominant microwave emission mechanisms, thermal bremsstrahlung and gyroresonance. Where gyroresonance is important, the coronal magnetic field strength can be determined with the aid of theoretical modeling. CoMStOC has provided an unprecedented set of coordinated multi-waveband observations of five new cycle active regions, offering a varied sample of intensity, activity, complexity, and projection angle. Whatever the final scientific return from the detailed studies now in progress, CoMStOC has already provided a wealth of experience in obtaining coordinated, multi-waveband observations of solar active regions.
Preliminary results from the coronal magnetic structures observing campaign (CoMStOC)
Advances in Space Research ; 8 , 11 ; 189-192
1989-01-01
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Results from CoMStOC: The coronal magnetic structures observing campaign
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