Dating an ice queen
The amount of "leakage" depends on the height of the ionosophere, which changes primarily in response to the Solar cycle, with periods of maximum solar activity corresponding to the highest extent of the ionosphere.It should be noted that the 10Be/9Be ratios for some ice cores have been compared with the known solar cycle and are in excellent agreement with what is known (accurately showing the time of the European Little Ice Age, which corresponded with a remarkably low amount of solar activity). 9Be and 35Cl) one can determine the season of the year the precipitation occurred.
The Earth's magnetic field then traps them, with only a slight "leakage" of the isotopes to the lower atmosphere.The major disadvantage of this method is that one must have a previously age-dated ice core to start with.In this method one compares certain inclusions in dated ocean cores with related inclusions found in the ice-core of a still undetermined age. Hyde has posted separately some of the relationships between ocean core data and their astronomical causes.The major advantage of these methods is that they can be completed relatively quickly.
The major disadvantage is that if the predetermined age markers are incorrect than the age assigned to the ice-core will also be incorrect.
Both 10Be and 36Cl are formed as charged ions in the ionosphere.