The Effects of the Atmosphere on Radio Astronomy Observations Dana S. Balser.

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Presentation transcript:

The Effects of the Atmosphere on Radio Astronomy Observations Dana S. Balser

The Effects of the Atmosphere on the Radio Signal

Atmospheric Refraction Green (1985) Maddalena & Johnson (2006) Plane Parallel Spherical

Anomalous Refraction (Seeing) Olmi (2002)

Atmospheric Absortion Condon (2007)

Atmospheric Emission (Noise) Condon (2007) Balser (2004) System Temperature Elevation

Atmospheric Stability Mason & Perera (2011)Balser (2011) 9 GHz 90 GHz Stability Fraction IR Irradiance Tsys (90GHz) good poor

Weather Forecasts Vertical Profiles from GOES and Balloon Soundings (NOAA) Maddalena: ~rmaddale/Weather

The Effects of the Atmosphere on the Telescope Repeatable Errors: Gravity  Static Corrections Non-repeatable Errors: Thermal (slow) Wind (fast)  Dynamic Corrections

Telescope Adjustments Focus Surface Pointing

Telescope Performance

Thermal Effects: pointing, focus, surface shape Time Axial Focus

Telescope Pointing and Focus: thermal model Constantikes (2007)

Telescope Surface: OOF Holography Nikolic et al. (2007)

Wind Effects: pointing Condon (2003)

Quadrant Detector  Flag bad data  Correct maps from arrays  Real-time corrections

Map Corrections Ries et al. (2009) Before After

Fini

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