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Summary        About Us     The Question       Hypothesis     Research      Experiment   Data   Observations

Conclusion      Works Cited      Submit your project




Project Summary
Hundreds of schools around the world, coordinated by Stanford’s Solar
Center, are engaged in hunting solar flares using a low cost device called
SID monitor. Our school, Liceo Scientifico-Tecnologico "Vallauri" in
Fossano (Italy), is one of those (Italy-10 in the SID Stanford database)



How does the SID monitor work?

The Sun is not a quiet star. Every now and then it produces bursts of
energy called solar flares. When this radiation reaches the Earth, it
disturbs the ionosphere which is essential to radio signals propagation,
causing a SID, a Sudden Ionospheric Disturbance.

The SID monitor is a device which records the intensity of a signal coming
from a VLF radio station (VLF = Very Low Frequency) which is normally
employed in communication with submarines. This signal has a
characteristic daily pattern, but when a Sun flare occurs, a more or less
pronounced peak pops up on the graph. Needless to say, not every
disturbance comes from the Sun. For a reliable identification of a flare it is
therefore necessary to compare the SID monitor data with the X-ray flux
data coming from NASA's GOES satellites.




                           Stanford's SID Monitor

The problem

The signals recorded by the SID monitor, however, are often very
disturbed by background noise, therefore weak flares can be difficult to
identify; besides that, a complex procedure is required to compare data
recorded by the schools with those coming from observations by GOES
satellites, the ultimate reference point in the identification of disturbances
coming from the Sun.



Research
disturbed by background noise, therefore weak flares can be difficult to
identify; besides that, a complex procedure is required to compare data
recorded by the schools with those coming from observations by GOES
satellites, the ultimate reference point in the identification of disturbances
coming from the Sun.



Research

In our project we have tackled these problems using a mathematical
technique called "empirical mode decomposition" (EMD) through which a
data set can be decomposed into a finite and often small number of
"intrinsic mode functions" (IMFs).

After the decomposition, we were able to identify the functions associated
with background noise and eliminate them.

To achieve this result, we have designed an experiment in which we
produce "artificial flares" (don't worry, there's no danger!). Despite the fact
that we have a significant amount of data collected from 2008 to 2011, we
wanted to control the flare parameters (duration and amplitude) and study
their effect on the individual signal components.

To clarify the principles of this technique, we have produced a sound
transposition of the signal (sonification), which proves how accurate the
EMD is.



The final product

Thanks to the results obtained in this project, we were able to write a
program, called SidDataAnalyzer, which decomposes the SID monitor
signal, "cleans" it from noise and produces a variety of graphical
representations of our data, superimposed to graphs of X-ray flux from
NASA satellites. We believe that our product can be of great help to all of
the schools that work with Stanford SID monitors and that's why we are
going to distribute this software for free.




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Summary

  • 1. http://sites.google.com/site/siddataanalyzer Summary About Us The Question Hypothesis Research Experiment Data Observations Conclusion Works Cited Submit your project Project Summary Hundreds of schools around the world, coordinated by Stanford’s Solar Center, are engaged in hunting solar flares using a low cost device called SID monitor. Our school, Liceo Scientifico-Tecnologico "Vallauri" in Fossano (Italy), is one of those (Italy-10 in the SID Stanford database) How does the SID monitor work? The Sun is not a quiet star. Every now and then it produces bursts of energy called solar flares. When this radiation reaches the Earth, it disturbs the ionosphere which is essential to radio signals propagation, causing a SID, a Sudden Ionospheric Disturbance. The SID monitor is a device which records the intensity of a signal coming from a VLF radio station (VLF = Very Low Frequency) which is normally employed in communication with submarines. This signal has a characteristic daily pattern, but when a Sun flare occurs, a more or less pronounced peak pops up on the graph. Needless to say, not every disturbance comes from the Sun. For a reliable identification of a flare it is therefore necessary to compare the SID monitor data with the X-ray flux data coming from NASA's GOES satellites. Stanford's SID Monitor The problem The signals recorded by the SID monitor, however, are often very disturbed by background noise, therefore weak flares can be difficult to identify; besides that, a complex procedure is required to compare data recorded by the schools with those coming from observations by GOES satellites, the ultimate reference point in the identification of disturbances coming from the Sun. Research
  • 2. disturbed by background noise, therefore weak flares can be difficult to identify; besides that, a complex procedure is required to compare data recorded by the schools with those coming from observations by GOES satellites, the ultimate reference point in the identification of disturbances coming from the Sun. Research In our project we have tackled these problems using a mathematical technique called "empirical mode decomposition" (EMD) through which a data set can be decomposed into a finite and often small number of "intrinsic mode functions" (IMFs). After the decomposition, we were able to identify the functions associated with background noise and eliminate them. To achieve this result, we have designed an experiment in which we produce "artificial flares" (don't worry, there's no danger!). Despite the fact that we have a significant amount of data collected from 2008 to 2011, we wanted to control the flare parameters (duration and amplitude) and study their effect on the individual signal components. To clarify the principles of this technique, we have produced a sound transposition of the signal (sonification), which proves how accurate the EMD is. The final product Thanks to the results obtained in this project, we were able to write a program, called SidDataAnalyzer, which decomposes the SID monitor signal, "cleans" it from noise and produces a variety of graphical representations of our data, superimposed to graphs of X-ray flux from NASA satellites. We believe that our product can be of great help to all of the schools that work with Stanford SID monitors and that's why we are going to distribute this software for free. Science Fair Rules Science Fair Resources Science Fair Help Accedi Attività recente del sito Termini di servizio Segnala abusi Stampa pagina Rimuovi accesso | Traduci Powered by Google Sites