A three hourly quasi-logarithmic local index of geomagnetic activity relative to an assumed quiet day curve for the recording site. K index measures the deviation of the most disturbed horizontal component and its value range from 0 (very quiet) up to 9 (extremely disturbed)..

Absolute temperature scale, in which exist, theoretically, the zero value temperature. This zero temperature would correspond to absence of molecular motion.

Waves trapped in the equatorial region which propagate to eastward and to upward.

This instability can occur when there is velocity shear within a continuous fluid or, when there is sufficient velocity difference across the interface between two fluids.

Waves generated by Kelvin-Helmholtz Instability.

They are meridional and zonal slices made in airglow images though the zenith. Keograms are useful to study medium-scale gravity waves and plasma bubble dynamics.

It is a prefix in the SI system of units denoting a factor of 1E3.

It is quasi-logarithmic local index of the 3-hourly range in magnetic activity relative to an assumed quiet-day curve for a single geomagnetic observatory site. It consists of a single-digit 0 thru 9 for each 3-hour interval of the universal time day. The K index measures the deviation of the most disturbed horizontal component.

Energy associated to motion.

The planetary 3-hour-range index Kp is the mean standardized K-index from 13 geomagnetic observatories distributed around the world. The scale is O to 9 expressed in thirds of a unit, e.g. 5- is 4 2/3, 5 is 5 and 5+ is 5 1/3. This planetary index is designed to measure solar particle radiation by its magnetic effects.

The Kuiper belt sometimes called the Edgeworth-Kuiper belt, is a region of the Solar System beyond the planets extending from the orbit of Neptune (at 30 AU) to approximately 55 AU from the Sun. Like the asteroid belt, it consists mainly of small bodies, or remnants from the Solar System's formation. While the asteroid belt is composed primarily of rock and metal, the Kuiper belt objects are composed largely of frozen volatiles (termed "ices"), such as methane, ammonia and water.