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Description
In our paper, we describe the content of the platform for the educational courses in geomagnetism was done in HTML (Hypertext Markup Language), CSS (Cascading Style Sheets) and JavaScript. HTML tells the browser what elements should be included in the web page (and in what order). CSS tells the browser how each element should be styled. JavaScript provides a means for web page authors to manipulate these elements programmatically and in response to end-user actions. HTML markup codes include basic markup that delimits the HTML page/document, its title and the body of the page, structuring the document, inserting subheadings, paragraphs, delimiting lines, formatting text, creating hyperlinks and inserting content objects (e.g. tables, formulas, images or multimedia objects retrieved from files, forms). In the WEB platform we have included many analyses about extreme geomagnetic phenomena such us strong geomagnetic storms. Magnetic storms are phenomena with a large extension in time, on the order of days, during which oscillations with amplitudes that can reach the order of hundreds of nT, and with high frequencies appear. They are associated with periods of maximum solar activity. They are causally linked to the penetration into the ionosphere of a large quantity of electrically charged particles (solar wind), which bring changes in the values of the external component of the magnetic field. Magnetic storms can be best highlighted by studying the horizontal component of the magnetic field because it undergoes the most significant changes. Regardless of the time at which it occurs, the magnetic storm begins with an increase in the horizontal component, an increase that persists for 2 - 4 hours. This represents the initial phase of the storm. After this phase, there is a significant decrease in the value of the horizontal component below the value in the calm period that preceded the onset of the storm. This decrease is much larger than the increase in the initial phase, can last several hours and constitutes the paroxysmal phase of the storm. After this phase, there is a gradual return of the value of the horizontal component to the level of the previous period of the storm. This return is accompanied by disturbances and can sometimes extend over several days. The analysis of these phenomena is made in our paper by spectral and wavelet methods and are exemplified for many geomagnetic observatories, according to https://www.mathwoks.com/.
Implementation of the Geomagnetism Web Platform in The Geological Institute of Romania Web Domain, is a very broad topic. In this paper we have focused only on some basic aspects of this topic, in which we have made a short synthesis referring especially to declination measurements in airport areas and the influence of GIC on electrical power networks.
