Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...734...16t&link_type=abstract
The Astrophysical Journal, Volume 734, Issue 1, article id. 16 (2011).
Astronomy and Astrophysics
Astronomy
1
Sun: Coronal Mass Ejections, Sun: Flares, Sun: Radio Radiation
Scientific paper
Solar type III and type II radio bursts suffer severe bending and group delay due to refraction while escaping from the source where the refractive index μ can be as low as ~0 to the observer where μ ~ 1. These propagation effects can manifest themselves as errors in the observed directions and times of arrival at the telescope. We describe a ray-tracing technique that can be used to estimate these errors. By applying this technique to the spherically symmetric density model derived using the data from the WIND/Waves experiment, we show that (1) the fundamental and harmonic emissions escape the solar atmosphere in narrow cones (at 625 kHz the widths of these escape cones are ~1fdg1 and ~8°, respectively), (2) the errors in the angles as well as the times of arrival increase monotonically with the angle of arrival (at 625 kHz these errors are 0fdg26 and ~17.2 s for the fundamental and ~0fdg52 and ~7.6 s for the harmonic at the maximum possible angles of arrival of ~0fdg55 and ~4°, respectively), and (3) the lower the frequencies are, the higher the errors in both the angles and times of arrival are. This implies that at 625 kHz the measured arrival angles and arrival times of the fundamental and harmonic are off by ~50% and ~13%, and ~3.4% and ~1.5%, respectively.
Gopalswamy Nat
Macdowall Robert J.
Thejappa G.
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