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The Long Wavelength Array: Status and Updates
Jayce Dowell SLF III December 7, 2016
Instrument Status
The Long Wavelength Array: Status and Updates Jayce Dowell SLF III - - PowerPoint PPT Presentation
The Long Wavelength Array: Status and Updates Jayce Dowell SLF III - - PowerPoint PPT Presentation
The Long Wavelength Array: Status and Updates Jayce Dowell SLF III December 7, 2016 Instrument Status LWA1 Electronics Shelter 256 Dipoles 5 m 100 m LWA1 Outriggers 500 m LWA-SV LWA1 vs. LWA-SV Similar layout, Different
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LWA1
256 Dipoles Electronics Shelter 100 m 5 m
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LWA1
500 m Outriggers
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LWA-SV
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LWA1 vs. LWA-SV
- Similar layout,
antennas, analog receivers, and M&C systems
- HAL & SAL
- Beamformer
- TBN (all-sky) mode
with 100 kHz of bandwidth
- Different digital
backend
– DP at LWA1 – ADP at LWA-SV
- LWA-SV has only one
beam but allows for simultaneous real-time correlation over a wide bandwidth
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LWA Technology
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Science Highlights
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Overview
- 34 publications to date
– Pulsars – Ionospheric research and space weather – The Sun – Jupiter – Meteors
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Pulsars
Kevin Stovall’s update talk Friday morning Veronica Dike’s poster on pulsar polarization
Stovall et al. (2014)
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Space Weather and the Ionosphere
Greg Taylor’s talk
- n this event
Friday afternoon
Howard et al. (2016)
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Space Weather and the Ionosphere
Joe Malins’ talk on ionospheric modeling Friday afternoon
Howard et al. (2016)
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Meteors
See Ken Obenberger’s talk Friday afternoon
Obenberer et al. (submitted)
20 40 60 80 100 120 140
Altitude in km
0.17 0.34 0.5 0.67 0.83 1
Normalized Number of Events
Radio Afterglows Corrected Expectation
3 6 9 12 15 18
Number of Radio Events
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Meteors
See Ken Obenberger’s talk Friday afternoon
Obenberer et al. (submitted)
20 40 60 80 100 120 140
Altitude in km
0.17 0.34 0.5 0.67 0.83 1
Normalized Number of Events
Radio Afterglows Corrected Expectation
3 6 9 12 15 18
Number of Radio Events
100 200 300
Seconds
500 1000
Flux Density in Jy
100 200 300
Seconds
500 1000
Flux Density in Jy
LWA-SV LWA1
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Jupiter
Imai et al. (2016)
See Masafumi Imai’s poster for details of the multi-instrument work
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LWA1 Sky Survey
Dowell et al. (submitted)
74 MHz
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LWA1 Sky Survey
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Future Directions
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LWA
- Goal of 53 LWA
stations
- Baselines up to 400
km for resolution 2” at 80 MHz with mJy sensitivity
- Cost is ~$1M/station
State of New Mexico, USA
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eLWA
+ =
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eLWA
- LWA1 + LWA-SV
soon
- 14 antennas with
MJPs
- 16 MHz of bandwidth
- Two approved VLA
proposals
- See Frank Schinzel’s
talk this afternoon
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Beyond eLWA: ngVLA and ngLOBO
- The Next Generation VLA is an opportunity
for a low frequency “ride along”
– Builds off VLITE at P-band and eLWA at 4- band – Infrastructure sharing saves costs and has interesting baseline lengths (~300 km) – ngLOBO commensal system that does 4+P
- See Namir Kassim’s poster for the paths forward