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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

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

contents
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

introduction
Introduction
  • Terrestrial ionosphere
  • Methods of investigation
  • Our study: low ionosphere
vlf signals ionospheric probes
VLF signals – “ionospheric probes”
  • VLF wave propagation
  • Advantages:

- continual emission,

- large area involved for analyses,

- international collaboration:

AWESOME, AbsPAL, SAVNET, AARDDVARK

  • Belgrade VLF station
significance of low ionospheric study
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
importance of database
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

detection of events
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

ionospheric diagnostics
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)

physical and chemical processes preliminary results
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)

conclusions
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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