Astrophysics (Index)About

radio

(radio waves)
(electromagnetic radiation, frequency 3 kHz to 300 GHz)

Radio is electromagnetic radiation (EMR) with a wavelength of 1 mm or above (100000 km is sometimes cited as a maximum), i.e., in the frequency range of 3 kHz to 300 GHz. Infrared is adjacent to it on the high-frequency end. The low frequency end, e.g., past 100000 km wavelength, is sometimes called subradio. Radio astronomy, which began in the 1930s/1940s, has become a significant portion of astrophysical research. Other uses of radio include communication with research spacecraft, and in planetary science, the use of radar and "radio science", a term for miscellaneous radio-based measurements, often borrowing the spacecraft's communications radio, such as for gravity sounding.


(EMR,spectrum,band)
Further reading:
https://en.wikipedia.org/wiki/Radio_waves
https://en.wikipedia.org/wiki/Electromagnetic_spectrum
https://en.wikipedia.org/wiki/Radio_astronomy
https://science.nasa.gov/ems/05_radiowaves
https://scied.ucar.edu/learning-zone/atmosphere/radio-waves
https://www.britannica.com/science/electromagnetic-radiation/Radio-waves
WaveLFreqPhoton
Energy
  
1mm300GHz1.3meVbeginradio
100000km3.0Hz12×10-15eVendradio

Referenced by pages:
3C 303
3C 9
87GB Catalog of Radio Sources (87GB)
active galactic nucleus (AGN)
active galaxy
angular resolution
antenna pattern
antenna temperature
aperture synthesis
Arcminute Microkelvin Imager (AMI)
Arecibo Observatory (NAIC)
Arecibo Occultation Survey (AO)
ARGOS
ARO 12m Telescope
Astronomical Image Processing System (AIPS)
AT2019dsg
atmospheric window
Australia Telescope Compact Array (ATCA)
Australia Telescope Large Area Survey (ATLAS)
Australian Square Kilometre Array Pathfinder (ASKAP)
Axion Dark Matter Experiment (ADMX)
Badgerys Creek Interferometer 101-MHz Survey (Mills)
bandpass filter
bandwidth
beat frequency
black-body radiation
blazar
Bologna Survey of Radio Sources
Breakthrough Listen (BL)
Cambridge Catalog of Radio Sources (C)
Canadian Hydrogen Intensity Mapping Experiment (CHIME)
CASA
Cassini
CLEAN
core collapse supernova (CCSN)
Cosmic Anisotropy Telescope (CAT)
Cosmic Lens All-sky Survey (CLASS)
counterpart
CRATES
curvature radiation
Cygnus A (3C 405)
dark nebula
dark sky
dirty image
dispersion measure (DM)
Dominion Observatory 10.03 MHz Source Catalog (DB)
Dominion Observatory 1420 MHz Source Catalog (DA)
Dominion Radio Astrophysical Observatory (DRAO)
downconverter
Dragone telescope
DSA-2000
Dwingeloo Obscured Galaxy Survey (DOGS)
Earth-sized VLBI
EDGES
Effelsberg 100-m Radio Telescope
electric dipole radiation
electromagnetic radiation (EMR)
electromagnetic spectrum
elevation range
equatorial mount
extremely low frequency (ELF)
F4
Fanaroff-Riley classification
fast folding algorithm (FFA)
fast radio burst (FRB)
field-programmable gate array (FPGA)
filter bank
focal plane array (FPA)
frequency (ν)
frequency modulation (FM)
G band (G)
Galactic Emission Mapping (GEM)
galaxy cluster (CL)
geomagnetic storm
Giant Metrewave Radio Telescope (GMRT)
GLEAM
GOALS
Gould's Belt Distances Survey (GOBELINS)
Green Bank 300ft Telescope (GB300)
Green Bank 6-cm Radio Source Catalog (GB6)
Green Bank Observatory (GBO)
Green Bank Telescope (GBT)
greenhouse effect
Gregorian telescope
Hat Creek Radio Observatory (HCRO)
heterodyne spectrometer
high frequency (HF)
High Time Resolution Universe Survey (HTRU)
high-B radio pulsar (HBRP)
Hydrogen Accretion in Local Galaxies Survey (HALOGAS)
hydroxyl (OH)
ICRF
IMAGE­
infrared (IR)
Institut de radioastronomie millimétrique (IRAM)
intensity interferometer
interference
interferometer
interferometry
International Cometary Explorer (ICE)
Interplanetary Scintillation Array (IPS Array)
interstellar holography
ionosphere
IRAM 30m Telescope
ITU
Japan Aerospace Exploration Agency (JAXA)
jet
JUICE
Juno
K band
light pollution
LOPES
low frequency radio astronomy
Low-frequency Array (LOFAR)
Lunar Reconnaissance Orbiter (LRO)
magnetic dipole radiation
Magnetospheric Multiscale Mission (MMS)
magnitude
Mauna Kea
Mauna Kea Observatories (MKO)
MeerLICHT
Meier paradox
MERLIN
microwave
MIGHTEE
millimeter astronomy
millisecond pulsar (MSP)
MOJAVE
multichroic feedhorn array
N 103B
Nançay Radio Telescope (NRT)
NASA Deep Space Network (NASA DSN)
National Radio Astronomy Observatory (NRAO)
Ohio Radio Survey (OSS)
Ooty Radio Telescope (ORT)
optical interferometer
Owens Valley Radio Observatory (OVRO)
PALFA
panchromatic
PAPER
parallax
Parkes Catalog (PKS)
Parkes Multibeam Pulsar Survey (PMPS)
Parkes Observatory
Parkes-MIT-NRAO Surveys (PMN)
passband
phased array
pipeline
plasma frequency
point source sensitivity
pointing error (PE)
position-position-velocity space (PPV)
prime focus
pulsar (PSR)
pulsar wind nebula (PWN)
Q band
quad-ridge flared horn (QRFH)
quasar (QSO)
Queen's University Radio Observatory (QRO)
R band
radar
radiative forcing (RF)
radio astronomy
Radio Camera Initiative (RCI)
radio frequency interference (RFI)
radio galaxy (RG)
Radio Galaxy Zoo (RGZ)
radio halo
radio phoenix
radio relics
radio science
radio source (RS)
radio source counts
radio star
radio supernova (RSN)
radio telescope
radiometer
radiometer equation
RASS/Green Bank Catalog (RGB)
RELIKT-1
RMS
RMS astronomy
Roma-BZCAT
rotating radio transient (RRAT)
Sag A*
SARAS
Sardinia Radio Telescope (SRT)
scintillometry
search for extraterrestrial intelligence (SETI)
SELENE
signal-to-noise ratio (SNR)
software telescope
Solar Orbiter (SolO)
space weather
specific intensity
speckle masking
speckles
spectral energy distribution (SED)
spectral index (α)
spectral line designation
Spektr-R
star formation (SF)
star formation rate (SFR)
STARE
STEREO
Strong Source Surveys
submillimeter astronomy
Submillimeter Telescope (SMT)
subradio
Sun surface features
super low frequency (SLF)
superluminal motion
synchronous orbit
synchrotron self-Compton (SSC)
synthetic aperture radar (SAR)
technosignature
telescope
Texas Survey of Radio Sources at 365 MHz (TXS)
thermal bremsstrahlung
Trace Gas Orbiter (TGO)
transient (AT)
ultra low frequency (ULF)
Ulysses
USS Sources
velocity dispersion (σ)
VERA
Very Large Array (VLA)
Very Long Baseline Array (VLBA)
very low frequency (VLF)
Very Small Array (VSA)
visibility
visible light
VLASS
water (H2O)
wavelength (λ)
Westerbork Synthesis Radio Telescope (WSRT)
Westerhout Radio Survey (W)
Wien's displacement law
Wind
young stellar object (YSO)
Yuan-Tseh Lee Array (YTLA)
zone of avoidance (ZOA)

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