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Հարց 124

What does the K-index measure?

  1. The relative position of sunspots on the surface of the Sun
  2. The short-term stability of Earth’s geomagnetic fieldՃիշտ պատասխան
  3. The short-term stability of the Sun’s magnetic field
  4. The solar radio flux at Boulder, Colorado

Բացատրություն

The K-index is derived from the largest deviation of the horizontal geomagnetic field seen at an observatory during a three-hour interval, so it reports how disturbed the field is right now. It says nothing about the Sun's own magnetic field or about sunspot positions.

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Հարց 124: What does the K-index measure? · FCC General Class (Element 3) · Questena