TNA to NOA Node

Description of the infrastructure

The National Observatory of Athens (NOA) conducts ionospheric sounding measurements providing data and products to research community.

   

Athens Digisonde-Portable-Sounder-4D (DPS4D): 

  • URSI code: AT138
  • Location: Penteli (Athens) Greece (GEO 38.0° N, 23.5° E)
  • Control and Data Platforms: LINUX and Windows 8.1, respectively
  • Transmitter Cards that support the signal processing of short-pulse waveform and long-pulse waveform
  • Frequency scan:  0.5 – 30 MHz
  • Data archiving: SAO, SAOXML, RSF/SBF, SKY, DVL, TLT
  • http://195.251.202.49/
  • Build-in Software: 
    • ARTIST 5.0 – ionogram scaling
    • DFT2SKY – Skymap calculation
    • DDAV – Calculation of drift velocity
    • DRGMaker – Calculation of directogram
    • TILT – Calculation of ionospheric tilt
    • Online image tools – production of images

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Geometry of the Athens DPS4D installation

    

Athens DPS4D experiments:

  • Standard mode
    • Vertical soundings every 5 min (carried out routinely): scanning ionogram; F-region drifts.
  • Special modes
    • Vertical soundings: fixed‐frequency ionogram; E-region drifts.
    • Bi-static oblique soundings jointly with one or more Digisonde systems (Digisonde-to-Digisonde operation).
    • Programmable selection of frequencies or frequency bands.
    • Flexible scheduling of sampling cadence.

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DCART (Digisonde Commanding and Acquisition Remote Terminal) application allows the selection of the sounding parameters

     

Products

Digisonde related data and products:

  • Ionospheric echoes parameters: Amplitude, phase, direction of arrival, virtual height, Doppler frequency & spread, ordinary & extraordinary wave polarization identification.
  • Ionospheric electron density profiles; ionospheric characteristics including foF2, foF1, foE, foEs, MUF(3000)F2, hmF2, hmF1, hmE and the IRI parameters B0, B1 and more (49 in total). Data archiving: SAO, SAOXML.
  • Ionosphere visualization products: Ionograms; Skymaps; Drift velocity plots; Directograms.

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  • Near-by GNSS (Global Navigation Satellite System) data: PENT Equipment TOPCON Net-G3, sampled with 30 or 1sec, with data, in tps, RINEX or RTK NOA1 sampled at 30sec, in daily RINEX.

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Athens Digisonde distance from PENT and NOA1 at 200m at an azimuth of -170°.

Other close stations include: 

GNSS Distance (km) Azimuth (o)
METO 9.5 -80
DION 6.7 62
DYNG
RAFI 13 105
ATHI 19.4 -131
KERT 29.1 160

         

Ionospheric predictions:

The European Digital Upper Atmosphere Server (DIAS) e-infrastrure (http://dias.space.noa.gr) operated by NOA delivers nowcasts, as well as short- and long-term predictions of ionospheric characteristics over Europe based on the implementation of ionospheric prediction models. The DIAS database contains data and model results from 2005 until today.

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An example of DIAS TEC maps

    

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An example of DIAS forecasting maps

    

Detection and prediction of TIDs:

The TechTIDE-EC H2020 warning system e-infrastructure (http://www.tech-tide.eu/) provides detection and prediction of Travelling Ionospheric Disturbances (TIDs) over Europe and Africa, based on several complementary methodologies. The TechTIDE database contains data and model results from 2017 onwards.

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Areas of access

NOA node is open to experiment proposals in the following fields:

  • Ionospheric forecasts driven by solar wind predictions
  • Validation of ionospheric specification models based on standardized methodologies
  • Modeling the propagation pattern of ionospheric irregularities in the bottomside and topside ionosphere
  • Ionospheric reconstruction profilers ingesting ground and space-based observations
  • Identification and propagation pattern of Travelling Ionospheric Disturbances (TIDs)
  • Digisonde experiments
    • Vertical Soundings
    • Joint experiments/special campaigns with bistatic HF sounders’ operations.

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Info

TNA to NOA Node info (downloadable pdf file)

Contact persons: Dr Ioanna Tsagouri (tsagouri@noa.gr), Dr Anna Belehaki (belehaki@noa.gr)