Course : Εισαγωγή στη Ραδιοστρονομία
Course code : PH338C
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Introduction: What is radio astronomy
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Radiation mechanisms in the radio window
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Propagation through plasmas and the interstellar medium
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Antennas, beams, and single-dish observing
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Receivers, backends, digitization, and RFI
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Spectral-line radio astronomy
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Polarization and magnetic fields
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Pulsars and pulsar timing
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Transients, FRBs, surveys, and time-domain radio astronomy
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Interferometry I: the fundamental idea
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Interferometry II: calibration and imaging
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VLBI, astrometry, geodesy, and extreme angular resolution
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High-frequency radio astronomy: ALMA, sub-mm astronomy, and the EHT
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SETI, technosignatures, future facilities
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Introduction: What is radio astronomy
Propagation through plasmas and the interstellar medium
Lecture topics
Dispersion, Faraday rotation, scattering, scintillation, absorption. The ionosphere. The interstellar medium as both nuisance and diagnostic. Dispersion measure, rotation measure, scattering time, scintillation bandwidth. Relevance to pulsars, FRBs, low-frequency arrays, and precision timing.
Key concepts
dispersion measure (DM), rotation measure (RM), plasma frequency, group delay, scattering tails, scintillation, depolarization.