Blar i forfatter "Heino, Erkka Petteri"

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    • Cosmic noise absorption during solar proton events in WACCM-D and riometer observations 

      Heino, Erkka Petteri; Verronen, Pekka T.; Kero, Antti; Kalakoski, Niilo; Partamies, Noora (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-18)
      Solar proton events (SPEs) cause large‐scale ionization in the middle atmosphere leading to ozone loss and changes in the energy budget of the middle atmosphere. The accurate implementation of SPEs and other particle ionization sources in climate models is necessary to understand the role of energetic particle precipitation in climate variability. We use riometer observations from 16 riometer stations ...

    • Cutoff Latitudes of Solar Proton Events Measured by GPS Satellites 

      van Hazendonk, Charlotte Maartje; Heino, Erkka Petteri; Jiggens, Piers T.A.; Taylor, Matthew G.G.T.; Partamies, Noora; Mulders, Hjalmar C. J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-15)
      Solar energetic particles (SEPs), one of the main causes of particle radiation in interplanetary space, can disrupt radio communication, induce spacecraft failures and change the heating and cooling rates in the atmosphere among others. To investigate the impact of SEPs and more specifically solar proton events (SPEs), we established a cutoff latitude database based on energetic particle data from ...

    • Space and atmospheric physics on Svalbard: a case for continued incoherent scatter radar measurements under the cusp and in the polar cap boundary region 

      Baddeley, Lisa; Lorentzen, Dag Arne; Haaland, Stein Egil; Heino, Erkka Petteri; Mann, Ingrid Brigitte; Miloch, Wojciech Jacek; Oksavik, Kjellmar; Partamies, Noora; Spicher, Andres; Vierinen, Juha-Pekka (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-04)
      Incoherent scatter radars (ISRs) represent the only instrument (both ground and space based) capable of making high temporal and spatial resolution measurements of multiple atmospheric parameters—such as densities, temperatures, particle velocities, mass flux—over an altitude range covering the entire mesosphere/lower thermosphere/ionosphere (MLTI) system on a quasi-continuous basis. The EISCAT ...

    • Spatial extent of solar proton impact in the Earth's atmosphere - Observations and modeling 

      Heino, Erkka Petteri (Doctoral thesis; Doktorgradsavhandling, 2019-12-18)
      Solar proton events cause large-scale ionization in the Earth's middle atmosphere leading to chemical changes, changes in the energy budget of the middle atmosphere, and radio wave absorption. The accurate implementation of the spatial impact of solar protons and other particle ionization sources in climate models is necessary to understand the role of energetic particle precipitation in natural ...

    • SuperDARN radar-derived HF radio attenuation during the September 2017 solar proton events 

      Bland, Emma; Heino, Erkka Petteri; Kosch, Michael J.; Partamies, Noora (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-10)
      Two solar proton events in September 2017 had a significant impact on the operation of the Super Dual Auroral Radar Network (SuperDARN), a global network of high‐frequency (HF) radars designed for observing F region ionospheric plasma convection. Strong polar cap absorption caused near‐total loss of radar backscatter, which prevented the primary SuperDARN data products from being determined for a ...