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I mportance Of Very Low Frequency Radio Signal Data Registered By V LF -receiver System

I mportance Of Very Low Frequency Radio Signal Data Registered By V LF -receiver System. A . Nina, V. Čadež and V. Srećković Institute of Physics, Belgrade, Serbia Astronomical Observatory , Belgrade, Serbia. Contents. Ionosphere VLF signals – “ionospheric probes”

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I mportance Of Very Low Frequency Radio Signal Data Registered By V LF -receiver System

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  1. Importance Of Very Low Frequency Radio Signal DataRegistered By VLF-receiverSystem A. Nina, V. Čadež and V. Srećković Institute of Physics, Belgrade, Serbia Astronomical Observatory, Belgrade, Serbia

  2. Contents • Ionosphere • VLF signals – “ionospheric probes” • Importance of creating a database for studying the ionosphere and its applications in technical and scientific research such as: -detection of different events by VLF signals -ionospheric diagnostics -study of physical and chemical processes

  3. Introduction • Terrestrial ionosphere • Methods of investigation • Our study: low ionosphere

  4. VLF signals – “ionospheric probes” • VLF wave propagation • Advantages: - continual emission, - large area involved for analyses, - international collaboration: AWESOME, AbsPAL, SAVNET, AARDDVARK • Belgrade VLF station

  5. Significance of low ionospheric study • Science - detection of different pure natural and man-induced events - ionospheric diagnostics - study of physical and chemical processes • Telecommunications - radio communications, - planned networks of mobile communication satellites, - high precision applications of global navigation satellite systems, etc. • Explanation of application our database in scientific research and, consequently, in prediction of possible problems in the telecommunications

  6. Importance of database • Processes in the ionosphere are: -very complex - time- and space variable • Experiment: practically impossible to exactly simulate conditions in particular cases • Theory: no real time data available for all necessary parameters needed for theoretical analyses • Statistics: requires the existence of a database that can be used to analyze the ionosphere

  7. SGR 1806-20 HESSI Detection of events • Sun: - regular variation - transient variations • Outer space • Earth: - in the atmosphere - in the lithosphere pure natural man-induced

  8. Ionospheric diagnostics • The case considered: Solar flare February 18th, 2011 • Recorded data: - GOES-15 satellite - Belgrade AWESOMEreceiver - DHO (Germany) transmitter (23.4 kHz) • Theoretical model: Wait’s model of ionosphere • Numerical program for simulation VLF signal propagation: LWPC (Long-Wave Propagation Capability)

  9. Physical and chemical processes (preliminary results) G(t) – electron gain rate L(t) – electron loss rate Upper half of D region: I - Quasi equilibrium regime II - Photo-ionization regime III - Recombination regime P(t) – photo-ionization rate R(t) – recombination rate I(t) – radiation flux by satellite αeff – effective recombination coefficient Ks– coefficient (dependent on energy interval of data registered by satellite)

  10. Conclusions • Applications of low ionospheric investigations in science and information technologies • Research of low ionosphere by VLF waves • Importance of VLF radio signal dataregistered by receiversystems

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