geomagnetic excursionの例文

• Brief disruptions that do not result in reversal are called geomagnetic excursions.
• Scientific opinion is divided on what causes geomagnetic excursions.
• The records typically include long periods of small change with occasional large changes reflecting geomagnetic excursions and reversals.
• A related phenomenon, a geomagnetic excursion, amounts to an incomplete reversal, with no change in polarity.
• Except for recent periods of the geologic past, it is not well known how frequently geomagnetic excursions occur.
• A minority opinion, held by such figures as Richard A . Muller, is that geomagnetic excursions are not a spontaneous processes but rather triggered by external events which directly disrupt the flow in the Earth's core.