Abstract
view Abstract Citations (26) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High Dynamic Range Multifrequency Radio Observations of a Solar Active Region White, S. M. ; Kundu, M. R. ; Gopalswamy, N. Abstract High-dynamic-range multifrequency radio observations of a solar active region are presented. The evolution of the region is followed at 5 GHz as it rotates from the limb to disk center, and when it is at disk center, observations at 0.33, 1.5, 5, 8.4, and 15 GHz are used to analyze the distribution of density and magnetic field within the active region. A dynamic range of up to 1500 (at 8.4 GHz) was achieved because these data were well suited to the self-calibration technique. The signatures of both optically thick gyroresonance emission are unambiguously identified, and magnetic fields and optically thin thermal free-free emission are outlined. Images are compared at 5 and 8.4 GHz in order to identify regions in the trailing part of the active region where optically thin four-harmonic gyroresonance emission is contributing to the observed brightness temperatures at 5 GHz, indicating the presence of 450 G fields. Publication: The Astrophysical Journal Supplement Series Pub Date: February 1992 DOI: 10.1086/191641 Bibcode: 1992ApJS...78..599W Keywords: Solar Activity; Solar Radio Emission; Brightness Temperature; Solar Magnetic Field; Thermal Emission; Very Large Array (Vla); Solar Physics; RADIATION MECHANISMS: MISCELLANEOUS; SUN: RADIO RADIATION; SUN: SUNSPOTS full text sources ADS |
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
