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Radio Dynamic Imaging Spectroscopy: A New Technique for Sola

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by

Bin Chen

on 31 October 2013

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Transcript of Radio Dynamic Imaging Spectroscopy: A New Technique for Sola

Radio Dynamic Imaging Spectroscopy: A New Technique for Solar Flare Studies
The Standard Flare/CME Model
Radio Dynamic Imaging Spectroscopy
The 2012 March 3 Event
Solar Radio Bursts
Have been observed and studied since 1940s
Believed to be intimately related to magnetic energy release
However, their diagnostic power has not been fully explored, because of the lack of ...
Various Observational Evidences
The Neupert Effect
Cusp-shaped X-ray loops
Over-the-loop-top HXR sources
Double coronal X-ray sources
Flux rope eruption + current sheet + outflows/contracting loops
Liu et al 2013
But the picture is not yet completed...
Solar Observing with the VLA
Challenges:
Enormous increase in system temperature
Highly variable source
Solar data calibration: should be able to see both the ~1 Jy calibrators and >500,000 Jy Sun
Solar Mode Commissioning:
Carried out in Fall 2011 in the NRAO RSRO program
20 dB solar attenuators are used when observing the Sun
Hardware tests
Developing solar observing and calibration strategies
Capabilities:
Up to 4 GHz instantaneous bandwidth
50 ms time resolution
1 MHz frequency resolution
Full imaging capabilities
Dynamic Spectrum
Radio Image
The First JVLA Solar Observation
Type III-dm
bursts associated with an EUV jet
Fast electron
beam trajectories
Flux rope eruption and CME
Time history of the event
VLA Dynamic Imaging Spectroscopy
The Coronal Source
Decimetric spikes
Where are they located?
What is their role in flare energy release?
Full transcript