Diurnal Variation of Magnetic Declination

Answer: Option B. Less at the equator than near the poles.

Diurnal variation of Magnetic Declination is less at the equator than near the poles

Solution

Magnetic Declination: When the direction is checked by compass, it is found that there is a difference between the geographic north and the north pointed out by the compass. This difference between the geographical north and the one measured by the compass is called Magnetic Declination.

There are four types of Magnetic Declination variation.

• Diurnal variation
• Annual variation
• Secular variation
• Irregular variation

Factors influencing diurnal variation of Magnetic Declination are- Diurnal variation of Magnetic Declination is more in summer compared to winter and less in the equator than near the poles. Hence, the diurnal variation in magnetic declination is less at the equator than near the poles.

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