{ "culture": "de-DE", "name": "deklination", "guid": "F7598FBA-402E-42AE-BABA-55A486E2D488", "catalogPath": "", "snippet": "Die Karte zeigt den Winkelunterschied zwischen der am Magnetkompass angezeigten Nordrichtung und der geographischen Nordrichtung für das österreichische Bundesgebiet. Die Karte wird jährlich neu berechnet und erstellt.", "description": "

Geomagnetic Survey<\/b><\/font><\/p>

The geomagnetic survey focuses on recording slow spatial and temporal variations in the Earth's magnetic field, which are generated by geodynamic processes in the Earth's interior.
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The spatial dependence reflects the distribution of magnetic field sources: in the Earth's core, in the Earth's crust, and in the higher layers of the atmosphere. A distinction is made between slowly varying sources, which are responsible for the so-called secular variation, and rapidly varying sources. The latter originate from the interaction between the Earth's magnetic field and the solar wind. The survey focuses on local differences in the slowly varying components of the Earth's magnetic field.
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Since the mid-19th century, measurement campaigns with over 300 measuring points have been conducted in Austria at intervals of approximately 30 years. In addition, measurements are conducted annually at a few locations evenly distributed throughout Austria to update the survey. Together with continuous recordings of the Earth's magnetic field at the Conrad Observatory, these measurements provide precise information about the direction and strength of the Earth's magnetic field at any point and time in Austria, as well as a forecast of expected changes for the coming year. The data obtained form the basis for geomagnetic maps and provide an important reference for navigation. Together with similar data obtained worldwide, they represent an important basis for geophysical studies and for understanding dynamic processes in the Earth's core that are responsible for generating the Earth's magnetic field.
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Description of the map layers<\/font><\/b>
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Isolines of magnetic declination in degrees/minutes 2025
<\/b>The map shows isogons, i.e., lines with the same magnetic declination deviations, defined as the difference between the orientation of the compass needle and true north. Local magnetic declination changes slowly over time and must be taken into account in magnetic navigation systems. GeoSphere Austria conducts annual measurements in Austria to record the direction and strength of the Earth's magnetic field with the highest precision.<\/span><\/p>

Secular Measurement Points
<\/b>Secular points are carefully selected locations, far from local sources of disturbance, where the direction and intensity of the Earth's magnetic field are precisely recorded. There are currently 14 secular points in Austria that are measured annually. The measured values \u200b\u200bare reduced to a common point in time using continuous recordings at the Conrad Observatory and combined with another 300 points from the most recent national magnetic survey to geographically represent the parameters of the Earth's magnetic field. This provides information about the local structure of secular variations. Recording the spatial and temporal changes in the Earth's magnetic field is one of the main tasks of the GeoSphere Austria Magnetic Service.<\/span><\/p>

Magnetic secular point surveys are important for recording and understanding the constant changes in the Earth's magnetic field. The Earth's magnetic field is subject to natural fluctuations and changes that can affect navigation systems, communications systems, and other technological applications over time.<\/font><\/p>

By regularly measuring the Earth's magnetic field at various time and space scales, scientists can create models of the dynamic processes responsible for maintaining a magnetic field in the Earth's core. The Earth's magnetic field plays an important role in the long-term protection of the atmosphere and life against the solar wind. This also applies to infrastructure such as power distribution grids, satellites, and radio communications.
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Measurement Procedure
The measurements are carried out according to international guidelines of the <\/span>IAGA (International Association of Geomagnetism and Aeronomy)<\/a>. The following steps are planned:<\/span><\/p>

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