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07 February 2025 |
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Article overview
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A New Look at Type III Bursts and their Use as Coronal Diagnostics | Samuel Tun Beltran
; Sean Cutchin
; Stephen White
; | Date: |
2 Aug 2015 | Abstract: | We present meter wave solar radio spectra of the highest spectrotemporal
resolution achieved to date. The observations, obtained with the first station
of the Long Wavelength Array (LWA1), show unprecedented detail of solar
emissions across a wide bandwidth during a Type III/IIIb storm. Our flux
calibration demonstrates that the LWA1 can detect Type III bursts much weaker
than 1 SFU, much lower than previous observations, and that the distribution of
fluxes in these bursts varies with frequency. The high sensitivity and low
noise in the data provide strong constraints to models of this type of plasma
emission. The continuous generation of electron beams in the corona revealed by
the high density Type III storm is evidence for ubiquitous magnetic
reconnection in the lower corona. Such an abundance of reconnection events not
only contributes to the total coronal energy budget, but also provides an
engine by which to form the populations of seed particles responsible for
proton-rich solar energetic particle events. An active region with such levels
of reconnection and the accompanying type III/IIIb storms is here proposed to
be associated with an increase of SEP production if a CME erupts. The data’s
constraints on existing theories of type IIIIb production are used to make an
association of the observed type IIIb storm to specific electron beam paths
with increased inhomogeneities in density, temperature, and or turbulence. This
scenario ties in the observed timing of III and IIIb storms, constrained
theories of type III and IIIb emission, and the ability of the emitting AR to
produce a strong SEP event. The result requires but a single observable to
cement these ideas, the statistical correlation of type III/IIIb activity with
SEP-productive AR. | Source: | arXiv, 1508.0206 | Services: | Forum | Review | PDF | Favorites |
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