High-Frequency Geomagnetic Fluctuations at Auroral Oval and Polar Cap

P. Peitso*, E. I. Tanskanen, T. I. Pulkkinen, K. Mursula

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

130 Lataukset (Pure)

Abstrakti

Rapid magnetic fluctuations are known to be closely linked to the high-latitude geomagnetic activity, in particular, to geomagnetic pulsations and subtorms. Increasing amount of commercial activity in the arctic regions requires better monitoring capability and improved understanding on the effects of geomagnetic hazards to infrastructure. In this study, we analyze rapid, 1-s fluctuations in Greenland. To measure high-frequency geomagnetic fluctuations in the auroral oval and polar cap, we use high time resolution data of 1 s from 12 stations covering a large latitudinal range of 64 to 84 quasi-dipole geomagnetic latitude (QDGMlat). We found out that the large magnetic field fluctuations exceeding 0.2 nT/s are observed 10–30% of the time in auroral oval latitudes, depending on the solar cycle phase and station location. The latitudinal differences are much larger in fluctuation coverage (fractional derivative rate, FDR) than in fluctuations amplitude (dH/dt). The highest |dH/dt| and FDRs at noon are observed at the northern stations from 72 to 84 QDGMlat, while in south Greenland from 72 to 65 QDGMlat, the highest |dH/dt| and FDRs are recorded at midnight. The largest differences in seasonal variation between noon and midnight are observed in the polar cap, where a summer increase is seen at noon and almost flat seasonal profile at midnight.

AlkuperäiskieliEnglanti
Sivut1057-1072
Sivumäärä16
JulkaisuSpace Weather
Vuosikerta16
Numero8
Varhainen verkossa julkaisun päivämäärä23 heinäkuuta 2018
DOI - pysyväislinkit
TilaJulkaistu - elokuuta 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Projektit

    • 1 Päättynyt

    ReSoLVE1

    Nikbakhsh, S., Peitso, P., Tanskanen, E. & Hynönen, R.

    01/05/201631/12/2016

    Projekti: Academy of Finland: Other research funding

    Lehtileikkeet

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    Pyry Peitso

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    3 kohdetta/ Medianäkyvyys

    Lehdistö/media: Esiintyminen mediassa

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