Monday, 9 May 2011

HEPPA 2011, Granada, Spain

From today until Wednesday, the Workshop on High-Energy Particle Precipitation in the Atmosphere (HEPPA) is taking place in Granada, Spain. It is the third workshop of its kind. The first meeting took place in Helsinki, Finland, and the second workshop was held at NCAR in Boulder, Colorado. In Finnish language, "heppa" is what (young) children call a horse, thus it can be translated as "horsey."

Energetic particle precipitation from space can penetrate deep into the atmosphere. In the case of galactic cosmic rays even down to ground level. Energetic auroral precipitation routinely enters the mesosphere where it creates odd nitrogen. In the absence of sunlight at nighttime, or in the polar regions during the long polar nights, odd nitrogen lives long enough to be transported into the stratosphere where it contributes to the destruction of ozone.

Studies of these processes have been conducted for a number of years, but in 2007 it was recognised that in general particle precipitation effects in the atmosphere are not well enough understood. It was decided to arrange a workshop to discuss these topics, and HEPPA was born.

Since EISCAT is a very powerful tool for measuring the ionised part of the atmosphere down to altitudes of 60 km or so, EISCAT-related studies are well represented at the current workshop. Moreover, EISCAT Director Esa Turunen will present the status and plans for the future EISCAT_3D radar system.

  • EISCAT_3D Incoherent scatter facility -status of the project; Turunen, E., and the EISCAT 3D Project Team.
  • Atmospheric signatures of REP; Clilverd, M. A., C. J. Rodger, P. T. Verronen, A. Seppälä, E. Turunen, C.-F. Enell, Th.Ulich, J. Tamminen.
  • Global observations of thermospheric temperature and nitric oxide from MIPAS spectra; López-Puertas, M., B. Funke, D. Bermejo-Pantaleón, M. García-Comas, G. P. Stiller, T. von Clarmann, N. Glatthor, U. Grabowski, M. Kiefer, G. Lu.
  • The response of an incoherent scatter radar and riometer to the precipitation of MeV electrons; Kavanagh, A. J., C. J. Rodger, M. A. Clilverd, C-F. Enell and F. Honary.
  • Anomalous variations in the quiet daytime D-region ionosphere during the 1-year IPY experiment at the EISCAT Svalbard radar; Kero, A., C.-F. Enell, L. Roininen, Th.Ulich, E. Turunen, I. Häggström, P. T. Verronen, S.-M. Salmi.
  • ISSI project: Geospace Coupling to Polar Atmosphere; Seppälä, A., M. A. Clilverd, Th. Ulich, C.-F. Enell, A. Kero, D. Marsh, C. J. Rodger, E. Rozanov, T. Egorova, P. T. Verronen, S.-M. Salmi, E. Turunen.
  • Atmospheric Ionization Module OSnabrück (AIMOS)-Reliability analysis of AIMOS/- HAMMONIA in comparison to incoherent scatter observations; Wissing, J. M., M.-B. Kallenrode, J. Kieser, H. Schmidt, M. T. Rietveld, A. Strømme, P. J. Erickson.
For more information, please refer to the HEPPA web site at

Credit: The beautiful poster for the meeting was created by Andrés Alonso-Herrero, and last Friday's picture feature is a part of this poster.

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