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RADIO OBSERVATIONS WITH THE EXPANDED OWENS VALLEY SOLAR ARRAY (EOVSA)
8/12/201514th RHESSI Workshop
Dale E. Gary, Center for Solar-Terrestrial Research, Physics Department, NJIT
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EXPANDED OWENS VALLEY SOLAR ARRAY
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8/12/2015
Central array dishes tracking the Sun. EOVSA has 13 such antennas, operating at 2.5-18 GHz.
2.5-18 GHz
400 MHz
~ 40 MHz
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EOVSA FLARE SIMULATION
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Model images and EOVSA simulation for 16 representative frequencies
Example spectra at several points in the image data cube
Theoretical fit of the spectra to obtain physical parameters, such as this map of magnetic field strength
Gary et al. (2013)
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A FEW RECENT BURSTS
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STAR POINTING (BEFORE)
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STAR POINTING (AFTER)
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TOTAL POWER CALIBRATION
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Amplitude
Offset
FWHM
Background
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TOTAL POWER BEAM WIDTH
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TOTAL POWER OFFSETS
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EVENT COMPARISON WITH NORP
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SPECTRAL COMPARISON WITH NORP
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INTERESTING FEATURES
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2015 JAN 01 EVENT (C1.6)
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2015-05-05 X3 FLARE
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RADIO/HARD X-RAY LIGHT-CURVES
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HARD X-RAY AND RADIO SPECTRA
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RHESSI IMAGING (COURTESY EDUARD KONTAR)
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2015-06-22 M-CLASS FLARE
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TOTAL POWER VS. CORRELATED AMP.
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EOVSA ALL-DAY VISIBILITIES
8/12/2015
Baseline 1-2
Baseline 1-3
Baseline 2-3
Baseline 3-4
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ALL-DAY GOES VS. EOVSA
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C1-level
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2015-07-08 B0.1 EVENT(!)
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GOES DATA FOR 2015-07-08
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TOTAL POWER AND RHESSI
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CIRCULAR POLARIZATION To convert X, Y linear
polarization to R, L circular, timing is all important.
Different cable lengths for X and Y channels must be carefully compensated.
R = X - iY, L = X + iY
Calculation done digitally
8/12/2015
E
X
Y
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DATA ON GEOSTATIONARY SATELLITE
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BIG DISHES AND CALIBRATION
8/12/2015
Completely refurbished 27-m antennas (controller, motors, cabling, limit switches)
New He-cooled receivers—first one to be installed <insert month here>!
Provides sensitivity to use hundreds of calibration sources and short calibration times.
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CONCLUSIONS EOVSA is a fantastically capable, solar-dedicated
radio array that is now beginning to obtain science-quality data.
The fundamental challenge of sampling the entire 1-18 GHz radio spectrum at 1-s cadence has been met.
There are several milestones ahead of us to reach the goal of full spectral imaging, but we expect these to come quickly over the next few months.
EOVSA plays the role of a FASR-demonstrator (10% in size and cost), and we expect it demonstrate the exciting science to come with a larger, broader-band, higher-resolution instrument.
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