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 digital antennas, analog backend receivers, and M&C – DP at LWA1 systems – ADP at LWA-SV • HAL & SAL • LWA-SV has only one beam but allows for • Beamformer simultaneous real-time • TBN (all-sky) mode correlation over a wide with 100 kHz of bandwidth bandwidth

LWA Technology

Science Highlights

Overview • 34 publications to date – Pulsars – Ionospheric research and space weather – The Sun – Jupiter – Meteors

Pulsars Kevin Stovall’s update talk Friday morning Veronica Dike’s poster on pulsar Stovall et al. (2014) polarization

Space Weather and the Ionosphere Greg Taylor’s talk on this event Friday afternoon Howard et al. (2016)

Space Weather and the Ionosphere Joe Malins’ talk on ionospheric modeling Friday afternoon Howard et al. (2016)

Meteors See Ken 1 Radio Afterglows 18 Corrected Expectation Obenberger’s Normalized Number of Events 0.83 15 talk Friday Number of Radio Events afternoon 0.67 12 0.5 9 0.34 6 0.17 3 0 0 20 40 60 80 100 120 140 Altitude in km Obenberer et al. (submitted)

Meteors LWA1 LWA-SV See Ken 1 Radio Afterglows 18 Corrected Expectation Obenberger’s Normalized Number of Events 0.83 15 talk Friday Number of Radio Events afternoon 0.67 12 0.5 9 0.34 6 Flux Density in Jy Flux Density in Jy 0.17 3 1000 1000 500 500 0 0 20 40 60 80 100 120 140 0 0 Altitude in km Obenberer et al. (submitted) 0 100 200 300 0 100 200 300 Seconds Seconds

Jupiter Imai et al. (2016) See Masafumi Imai’s poster for details of the multi-instrument work

LWA1 Sky Survey 74 MHz Dowell et al. (submitted)

LWA1 Sky Survey

Future Directions

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

eLWA + =

eLWA • LWA1 + LWA-SV soon • 14 antennas with MJPs • 16 MHz of bandwidth • Two approved VLA proposals • See Frank Schinzel’s talk this afternoon

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