Fine structure in a metric type IV burst: Multi-site spectrographic,polarimetric, and heliographic observations |
| |
Authors: | G P Chernov K -L Klein P Zlobec H Aurass |
| |
Institution: | (1) IZMIRAN, 142092 Troitsk, Moscow Region, Russia;(2) Section d'Astrophysique de Meudon, DASOP, CNRS-URA 1756, Observatoire de Paris, 92195 Meudon, France;(3) Osservatorio Astronomico, via G.B. Tiepolo 11, 34131 Trieste, Italy;(4) Astrophysikalisches Institut Potsdam, Observatorium für solare Radioastronomie, 14552 Tremsdorf, Germany |
| |
Abstract: | The spectral fine structure of solar radio continua is thought to reveal wave-particle and wave-wave interactions in magnetic traps in the solar corona. We present observations of spectra, polarization, and spatial characteristics of combined emission/extinction features ( zebra patterns ) during a decimetric/metric type IV event on 5 June, 1990. Very high modulation depths are observed. The size and location of the sources during emission and extinction are determined for the first time. Two remarkable features are found: (1) The sources of emission stripes have finite size, up to nearly 2 ; during extinction stripes the brightness is reduced across the whole extent of the unperturbed continuum, which is slightly larger than 2 . (2) During emission stripes the sources drift over distances up to several × 104 km, with apparent velocities up to 105 km s–1. The observed features are briefly discussed with respect to interpretations based on wave-particle interactions and on the scattering of electromagnetic waves. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|