• Educational Activities for Students

    The educational program for children at Thissio Visitor Center

  • Doridis Telescope

    Doridis Telescope

  • WMO certificate
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  • August

    August 2017 | Photo: Theofanis Matsopoulos


    Julius Schmidt, CHARTE DES GEBIRGE DES MONDES, 1878, ΝΟΑ Library

  • simonvouet English2

    Simon Vouet (1590 - 1649), The Muses Urania and Calliope (1634)

    National Gallery of Art, USA

  • Τηλεσκόπιο Αρίσταρχος English

    Aristarchos Telescope, Helmos Observatory

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    Helmos Observatory, Photography: Harry Katzjaeger
    Source: "Top Shots," National Geographic, June 2012

  • Eskimo Nebula NGC2392 English

    Eskimo Nebula (NGC2392), Aristarchos Telescope, Observer: Dr. Ioannis Alikakos (NOA)

    Digital Image Processing: Theofanis Matsopoulos.

  • Μουσείο Γεωαστροφυσικής English

    Geoastrophysics Museum, Thissio

  • Εκπαίδευση στο ΕΑΑ English

    Summer School in Astrophysics

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    Remote Sensing & Earth Observation

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    Greece from the International Space Station

    Photography: Paolo Nespoli, ESA astronaut

  • 3D Sun English

    3D Image of the Sun from the Solar Dynamics Observatory (SDO) mission of NASA.

    Source: NASA's Solar Dynamics Observatory

  • Helicorder English

    Analogue seismograph recorder

  • Geothermal English
  • Παλιρροιογραφος English

    Tide-gauge of the Instittute of Geodynamics at Vlyhada, Santorini.

  • Πειραμα Ulusses English
    Recovered  Ocean Bottom Seismometers on board of research vessel in the frame of the ULYSSES scientific program
  • Meteo historic archive english

    The historic archive of NOA/IERSD with recordings of climatic observations dated from the mid-19th century is one of the oldesr sources of climatic information for Eastern Medirranean.

  • Meteo time-series graph English

    The evolution of the average annual temperature in Athens from the mid-19th century until today, according to the records of the historic station NOA/IERSD (Hill Nymphs Thission).

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014




Multi-satellite, multi-instrument and ground based observations analysis and study of ULF wave phenomena and products

Funding Organization:

European Space Agency (E.S.A.)

NOA Role:


Scientist in charge:

Dr. G. Balasis

Start Date:


End Date:


Project Website:


Number of Personnel under NOA Contracts



In the ULFwave project, we will analyze and study ULF waves using magnetic and electric measurements from multiple ongoing space missions as well as ground-based instruments. Specifically, a comprehensive dataset will be completed for this purpose based on space-borne measurements collected at the equatorial plane ( THEMIS mission), at high magnetic latitudes ( Cluster mission) and low Earth orbit ( CHAMP mission). This will be complemented by measurements from ground-based observatories (SAMBA, CARISMA , THEMIS-ground , ENIGMA arrays and INTERMAGNET network).

Basic derived quantities of our analysis will include wavelet power spectra (E, B), wave peak frequency and amplitude, wave occurrence duration and timing with regard to major magnetospheric phenomena, like storms, substorms, radiation belt enhancements.

Since ULF waves influence strongly the Earth's magnetospheric dynamics, they are of particular relevance for space weather nowcasting and forecasting efforts. This project will focus on the central role that ULF waves in the dynamics of the outer radiation belt, through particle energization, scattering and transport across the magnetic field lines. The results of the waves' analysis and in particular, the characteristics of the ULF wave propagation will be used to advance the current understanding of the radiation belt wave environment. Such information is crucial for modeling wave-particle interactions.

In the preparation phase of Swarm, the analysis of specific ULF waves can help understand the processes that play a crucial role in generating the waves with specific propagation characteristics. The latter is expected to be coupled with radiation belts and ring currents. Present day data from CHAMP, Cluster and THEMIS can be used to study this topic in detail. A better understanding of the process and wave propagation will provide the opportunity for geophysical validation of some of the Swarm products, especially those related to the vector magnetic and electric field data.

The overall expected benefits from the study are:

  • Improved understanding of the wave activity / propagation and the underlying processes.
  • Analysis of existing satellite and ground data also in view of potential LEO satellite validation (test with CHAMP in preparation of Swarm).
  • Special focus on the additional opportunities that Swarm brings through magnetic and electric field (and density) data from a constellation of satellites also in view of potential new products/user tools.
  • Projection of the ideas for the Swarm lifetime especially the expected combination with Cluster at that time.



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Penteli Visitor Center
Thissio Visitor Center
Educational program on Meteorology
Multiple Events

Real Time Seismicity

Institute of Geodynamics
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Weather Forecast


View the latest weather forecasts, maps, and alerts for Greece on meteo.gr


The Sky Today


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