| Autor: | Barry Rothberg, Robert F. Willson, J. N. Kile |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
Very large array Astrophysics::High Energy Astrophysical Phenomena Semi-major axis Astronomy Astronomy and Astrophysics Storm Coronal loop Astrophysics Magnetic field Space and Planetary Science Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Geostationary Operational Environmental Satellite |
| Zdroj: | Solar Physics. 170:299-320 |
| ISSN: | 0038-0938 |
| DOI: | 10.1023/a:1004987224796 |
| Popis: | The presence of coronal magnetic fields connecting active regions is inferred from decimetric observations of solar noise storms with the Very Large Array (VLA) and from soft X-ray images taken by Yohkoh. Temporal changes in the noise storms appear to be correlated with some soft X-ray bursts detected by both Yohkoh and the GOES satellite. Combined analysis of the radio and X-ray data suggests a re-arrangement of the coronal magnetic field during the onset of impulsive noise storm burst emission. On one day during the combined VLA–Yohkoh–GOES observations, two widely-separated active regions appear to be connected by a faint trans-equatorial 91 cm source as well as two distinct soft X-ray loops. The two active regions show anti-correlated fluctuations in decimetric radio emission. On another day of combined VLA–Yohkoh observations, a series of 91 cm noise storm bursts are observed along the major axis of the associated noise storm continuum. Time sequences of Yohkoh soft X-ray images show a contraction of coronal loops prior to the onset of this series of bursts and a corresponding increase in the X-ray flux in the apparent footpoint of the overarching loop containing the noise storm. These observations imply that energy from a realignment of the magnetic field is being transferred, possibly by accelerated particles, along loops connecting separated active regions on the Sun. |
| Databáze: | OpenAIRE |
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