Solar Burst Submillimeter Wave Emission Components Associated To Microwaves, Uv, X- And γ- Rays Continuum In Time And Space

Details Solar Burst Submillimeter Wave Emission Components Associated To Microwaves, Uv, X- And γ- Rays Continuum In Time And Space Solar Burst Submillimeter Wave Emission Components Associated To Microwaves, Uv, X- And γ- Rays Continuum In Time And Space

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9330k&link_type=abstract

American Astronomical Society Meeting 210, #93.30; Bulletin of the American Astronomical Society, Vol. 39, p.216

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The solar burst spectral component peaking somewhere in the terahertz (THz) range, along with, but distinct from, the well-known microwave component, bring new observational and theoretical possibilities to explore the flaring physical processes. The solar event of December 6, 2006, 18:30 UT, exhibited a particularly well-defined double spectral structure, with the THz spectral component detected at 212 and 405 GHz by SST and microwaves (1-18 GHz) by OVSA. The burst was observed by instruments in satellites at high energies, UV by TRACE, soft X-rays by GOES, X- to γ- rays by RHESSI. Although the event occupied an extended area at optical and UV wavelengths, showing various brightnings along several arcminutes, the hard X-ray emission region is restricted (within a region 30” x 50”) showing three sources at low energies (< 150 keV) and a single source above 300 keV. At submillimeter-waves, a precursor was observed, followed by a rapid impulsive event and a post-burst long-enduring component. This post-burst component was also accompanied by the largest flux-density decimeter burst ever reported, reaching 1 million solar flux units. The submillimeter impulsive burst centroid position at 212 GHz was clearly displaced from the precursor component by almost 1 arc-minute. The maximum limit sizes, estimated at 212 GHz, were of the order or smaller than the beam-sizes (4’). The microwave spectra for the precursor and long-enduring burst components peak at about 5-10 GHz. The submillimeter precursor spectrum might be optically thick emission of the cold chromospheric plasma. Despite the complexity in space, time and spectra of the superimposed impulsive and post-impulsive emission, it was remarkable that the THz impulsive component had its closer counterpart only in the higher energy X- and γ- rays ranges, suggesting that they are part of the same physical process, produced by a source of continuously accelerated high-energy particles.

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