A-index
An index of the conditions of the Earth’s magnetic field as measured at Boulder, Colorado. Propagation improves with lower measurement numbers. See URL:Propagation | ||||
Search Dictionary:
A-index definition was found in categories: Encyclopedia(1)
A-index Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
A-index
The A-index provides a daily average level for geomagnetic activity, based on the K-index. Because of the non-linear relationship of the K-scale to magnetometer fluctuations, it is not meaningful to take averages of a set of K indices. Instead, each K is converted into a linear scale called the "equivalent three hourly range" a-index (note the lower case). The daily A index is the average of eight "a" indices.
| See more at Wikipedia.org... |