http://sites.google.com/site/siddataanalyzerSummary        About Us     The Question       Hypothesis     Research      Ex...
disturbed by background noise, therefore weak flares can be difficult toidentify; besides that, a complex procedure is req...
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  1. 1. http://sites.google.com/site/siddataanalyzerSummary About Us The Question Hypothesis Research Experiment Data ObservationsConclusion Works Cited Submit your projectProject SummaryHundreds of schools around the world, coordinated by Stanford’s SolarCenter, are engaged in hunting solar flares using a low cost device calledSID monitor. Our school, Liceo Scientifico-Tecnologico "Vallauri" inFossano (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 ofenergy called solar flares. When this radiation reaches the Earth, itdisturbs 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 comingfrom a VLF radio station (VLF = Very Low Frequency) which is normallyemployed in communication with submarines. This signal has acharacteristic daily pattern, but when a Sun flare occurs, a more or lesspronounced peak pops up on the graph. Needless to say, not everydisturbance comes from the Sun. For a reliable identification of a flare it istherefore necessary to compare the SID monitor data with the X-ray fluxdata coming from NASAs GOES satellites. Stanfords SID MonitorThe problemThe signals recorded by the SID monitor, however, are often verydisturbed by background noise, therefore weak flares can be difficult toidentify; besides that, a complex procedure is required to compare datarecorded by the schools with those coming from observations by GOESsatellites, the ultimate reference point in the identification of disturbancescoming from the Sun.Research
  2. 2. disturbed by background noise, therefore weak flares can be difficult toidentify; besides that, a complex procedure is required to compare datarecorded by the schools with those coming from observations by GOESsatellites, the ultimate reference point in the identification of disturbancescoming from the Sun.ResearchIn our project we have tackled these problems using a mathematicaltechnique called "empirical mode decomposition" (EMD) through which adata 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 associatedwith background noise and eliminate them.To achieve this result, we have designed an experiment in which weproduce "artificial flares" (dont worry, theres no danger!). Despite the factthat we have a significant amount of data collected from 2008 to 2011, wewanted to control the flare parameters (duration and amplitude) and studytheir effect on the individual signal components.To clarify the principles of this technique, we have produced a soundtransposition of the signal (sonification), which proves how accurate theEMD is.The final productThanks to the results obtained in this project, we were able to write aprogram, called SidDataAnalyzer, which decomposes the SID monitorsignal, "cleans" it from noise and produces a variety of graphicalrepresentations of our data, superimposed to graphs of X-ray flux fromNASA satellites. We believe that our product can be of great help to all ofthe schools that work with Stanford SID monitors and thats why we aregoing 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

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