Course : Εισαγωγή στη Ραδιοστρονομία
Course code : PH338C
Definition
The rotation of the polarization angle as radio waves pass through magnetized plasma.
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Definition
The receiving element placed near the focus of a dish. It collects the focused radio signal.
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Definition
The amount of energy received per unit area, per unit time, per unit frequency. In radio astronomy it is usually measured in janskys
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Definition
An observation in which many pulses from a periodic source are averaged together using the known period, improving S/N.
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Definition
Radiation produced when free electrons are accelerated near ions in ionized gas. Important in H II regions and stellar winds.
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Definition
An observing technique where the receiver rapidly switches between nearby frequencies, often used for spectral-line calibration.
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Definition
The number of wave cycles per second, measured in hertz
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Definition
The oscillating response produced by interference between signals received at different antennas.
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Definition
A correction applied to account for Earth’s rotation and keep the phase of a source stable during observation.
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Definition
The width of the beam measured between the points where the response falls to half its peak value.
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