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The a-index is the three hourly equivalent amplitude for geomagnetic activity at a specific magnetometer station derived from the station-specific K-index. Because of the quasi-logarithmic relationship of the K -scale to magnetometer fluctuations, it is not meaningful to take the average of a set of K -indices directly.
Kp/ap index: 'a' is an index created from the geomagnetic disturbance at one midlatitude (40° to 50° latitude) geomagnetic observatory during a 3-hour period. 'K' is the quasilogarithmic counterpart of the 'a' index. Kp and ap are the average of K and an over 13 geomagnetic observatories to represent planetary-wide geomagnetic disturbances.
The 2003 Halloween solar storms had a peak Dst index of −383 nT, although a second storm on 20 November 2003 reached −422 nT while not reaching G5-class. [13] [14] The March 1989 geomagnetic storm had a peak Dst index of −589 nT, [15] while the May 1921 geomagnetic storm has been estimated to have had a peak Dst index of −907 ± 132 nT.
The K-Index or George's Index is a measure of thunderstorm potential in meteorology. According to the National Weather Service , the index harnesses measurements such as "vertical temperature lapse rate , moisture content of the lower atmosphere , and the vertical extent of the moist layer."
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KP-bil, or Terrängbil m/42 KP, a Swedish armoured vehicle; Kadomtsev–Petviashvili equation, describing waves; Keratosis pilaris, a human genetic disorder, also known as "chicken skin" keratic precipitate, an inflammatory cellular deposit on the cornea of the eye; Kilogram-force ("kilopond"), a unit measure of force; Kilopascal (kP), a unit ...
For the 10-day forecast, yr.no employs the ECMWF-ENS model with an 18 km resolution for Norwegian territories, and for the rest of the world, IFS-HRES with a 9 km resolution. [ 3 ] Outside Scandinavia, the 3-day forecasts are updated every six hours, and the 10-day forecasts every 12 hours.
Get the Boydton, VA local weather forecast by the hour and the next 10 days.