Lancaster University Department of Communication Systems Skymap at 38.2 MHz as Measured by IRIS Steve Marple.

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Presentation transcript:

Lancaster University Department of Communication Systems Skymap at 38.2 MHz as Measured by IRIS Steve Marple

Lancaster University Department of Communication Systems Skymap A skymap is a map of cosmic noise level in all directions. Required to generate theoretical quiet day curves * (QDCs) for riometry and system design Uses in astronomy, e.g., observing large-scale galactic features * QDC: background cosmic noise level in absence of absorption.

Lancaster University Department of Communication Systems Skymap [Cane, 1978]

Lancaster University Department of Communication Systems Jodrell Bank Radio Telescope Kilpisjärvi Jodrell Bank Lindau

Lancaster University Department of Communication Systems IRIS (Imaging Riometer for Ionospheric Studies) 64 crossed dipoles 49 imaging beams beam width 13° ~ 16° 6+ years of data Declination range: 14.1° °N

Lancaster University Department of Communication Systems Beam projection

Lancaster University Department of Communication Systems Received power affected by: Solar controlled D-region absorption Snow (modifies antenna performance)

Lancaster University Department of Communication Systems IRIS Skymap

Lancaster University Department of Communication Systems Cane and IRIS skymaps

Lancaster University Department of Communication Systems Summary Sky maps are needed for theoretical quiet day curves and system design An imaging riometer has been used as a radio telescope to produce a skymap Using riometer data from Antarctica a matching southern hemisphere map could be made