GG lec 4

Radiation and earths sun relation - Energy - A measure of the ability or capacity of a system to do work - Cannot be created or destroyed - Can be transferred - Radiant energy - Electromagnetic waves - Solar output - Clouds of charged gases from the sun's surface - Responsible for auroras, communication disruptions, weather links - Electromagnetic radiation - Different forms - Electromagnetic spectrums, measuring wavelengths - Model radiation using waveforms - Radiation principles - Objects with a temp above absolute zero emit radiation (0 K = -273.15 degree C) - The higher the temp, the greater the radiation being emitted and the wavelength will be shorter - Objects that are good emitters are also good absorbers - A blackbody is a perfect absorber and emitter - Net radiation (Q*) - The balance between incoming and outgoing radiation - K down - Incoming shortwave - K up - Outgoing shortwave - L down - Incoming longwave radiation - L up - Outgoing longwave radiation - Q* = (K down + L down) - ( K up + L up) - Earth-sun relations - The sun will have a greater radiation and have shorter wavelengths - The sun is hotter - The sun's radiative output - Ultraviolet - Visible - Near infra-red - The earth's radiative output - Thermal infra-red - Longwave radiation - Plane of ecliptic - A plane passing through all points in earth's orbit