Blar i forfatter "Martini, Dániel"

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    • Revisiting geomagnetic activity at auroral latitudes: No need for regular quiet curve removal for geomagnetic activity indices based on hourly data 

      Martini, Dániel; Argese, Chiara; Di Loreto, Massimo; Mursula, K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-24)
      The main objective of our study is to determine if the regular quiet daily curve (QDC) subtraction is a necessary procedure in quantifying the irregular geomagnetic variations at auroral latitudes. We define the hourly ΔH index, the absolute hour-to-hour deviation in nT of the hourly geomagnetic horizontal component, which assigns each sample to sample deviation as geomagnetic activity without ...

    • Services for Space Mission Support Within The ESA Space Situational Awareness Space Weather Service Network 

      De Donder, Erwin; Crosby, Norma B; Kruglanski, Michel; Andries, Jesse; Devos, Andy; Perry, Chris; Borries, Claudia; Martini, Dániel; Glover, Alexi; Luntama, Juha-Pekka (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-01-05)
      <p>Spacecraft operations are by nature complex and every satellite's operational environment poses a range of potential risks, often a unique combination for a given orbit. The implications of interruptions of operations, data transfer and service provision, are serious, both in terms of cost and capability, thus it is imperative to mitigate against all operational risks to the fullest extent ...