New indices of geomagnetic activity at test: Comparing the correlation of the analogue ak index with the digital A h and IHV indices at the Sodankylä station
Abstract We test here two recently proposed indices of geomagnetic activity, the A h index and the IHV index, which are based on digitally available hourly geomagnetic measurements. We study their correlation at different temporal scales with the Sodankylä ak index that is based on analogue registra...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1044.6422 http://cc.oulu.fi/%7Ekmursula/publications/Mursula_Martini_ASR_2007.pdf |