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Retrieving "Radio Spectrum" from the archives

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  1. Electromagnetic Signature

    Linked via "Radio"

    | :--- | :--- | :--- | :--- |
    | Static (Type $\alpha$) | Infrared, Visible | Stable emissivity/albedo profile | Unmoved geological features |
    | Dynamic (Type $\beta$) | Microwave, Radio | Rapid temporal fluctuation ($\Delta f > 1\ \text{Hz}$) | Moving vehicles, power transmission |
    | Idiosyncratic (Type $\gamma$) | VLF, [Sub-THz](/entries/sub-terahertz…

  2. Electromagnetic Spectrum

    Linked via "radio spectrum"

    Radio Waves
    Radio waves have the longest wavelengths ($\lambda > 1 \text{ mm}$) and lowest photon energies. They are generated by accelerating charged particles, such as oscillating currents in antennas. The radio spectrum is vast, encompassing everything from very low frequency (VLF) to extremely high frequency (EHF).…

  3. Quasars

    Linked via "radio spectrum"

    Classification of Quasars
    Quasars are broadly classified based on their relative strength in the radio spectrum, though modern classification increasingly relies on spectral features, particularly the behavior of the ultraviolet (UV) continuum.
    Radio-Loud vs. Radio-Quiet