累计磁极性偏转及其在发电机模型评估中的应用

地磁板性反转纪录通常用代表两种极性的黑白间隔所组成的极性柱来表示。这里引入累计磁极性偏转曲线，作为描述地磁极性反转记录的一种新方法。通过组合整个地质时期地磁极性间隔的长度所获得的这种曲线，使人们更容易想象任一时期内地磁场极性的偏转，以及磁场的滞后性质，它同时提供了一种评估地磁发电机模型的有效手段。本文通过实例论述：如何运用累计磁极性偏转方法，评估无量纲参数和信噪比两者的变化及其对磁极性偏转、极性带长度和极性变化频率的影响。

CUMULATIVE POLARITY BIAS AND ITS APPLICATION TO EVALUTION OF DYNAMO MODELS

The magnetic polarity reversal polarity reversal record is often illustrated by means of a column with black and white intervals depicting the two polarity. The cumulative polarity bias curve is introduced here as an alternative method to demonstrate the record of geomagnetic polarity reversals. This new methods, which is obtained by compounding the length of magnetic polarity bias of the magnetic field over any period of time, as well as the hysteretic properties of the field. It also serves as an efficient means for the evaluation of geodynamo models. An example is presented in this paper to demonstrate how the cumulative polarity bias can be used to evaluate the effects of variations in both the dimensionless parameters and the signal/noise ratio on the polarity bias, length and frequency of polarity zones.