Keogram

A keogram is a type of visual representation used primarily in the field of atmospheric science, particularly in the study of auroras and other phenomena related to the Earth's magnetosphere. It is a 2D image that captures the brightness or intensity of a specific phenomenon over time. In a keogram, time is represented on one axis (usually the horizontal axis), while the vertical axis represents a specific spatial dimension — often the zenith angle or latitude of the observation site.