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Brief Introduce of Planetary K-index: An Indicator of Geomagnetic Storms

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  • Jyh-Woei Lin

Abstract

The planetary K-index (Kp index) was a geomagnetic index in the H-component field. This index was calculated from data collected by a network of 13 ground-based magnetometer stations at mid-latitude locations from the International Real-time Magnetic Observatory Network (INTERMAGNET). The magnitudes of Kp index could indicate geomagnetic activity using the integer K-scale from 0 to 9 without dimension because the K-scale was estimated using the quasi-logarithms algorithm. The Kp index indicated geomagnetic storms under the condition of K-scale＞4. The three-hourly Kp index has been commonly used. The three-hourly Kp index was relatively stable for low‐variability geomagnetic activity. The hourly Kp index represented the level of auroral absorption with a more accurate characterization. For future research, the Kp index with a high sampling rate (e.g., ＜1 hour) could be considered, so that a very accurate characterization was characterized the more detailed geomagnetic activity of global region.

Suggested Citation

  • Jyh-Woei Lin, 2021. "Brief Introduce of Planetary K-index: An Indicator of Geomagnetic Storms," European Journal of Environment and Earth Sciences, European Open Science, vol. 2(5), pages 57-58, September.
    • Handle: RePEc:epw:ejgeo0:v:2:y:2021:i:5:id:16190
    DOI: 10.24018/ejgeo.2021.2.5.190
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    References listed on IDEAS

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    1. Jyh-Woei Lin, 2021. "Real-time Magnetic Observatory Network: A Review," European Journal of Environment and Earth Sciences, European Open Science, vol. 2(5), pages 1-2, September.
    2. Hansen, B. G. & Willekens, E., 1990. "The generalized logarithmic series distribution," Statistics & Probability Letters, Elsevier, vol. 9(4), pages 311-316, April.
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