My first study is about the flapping mechanism of Earth's magnetotail.

Using Cluster data, we propose that kink-like flapping motion is causally related to steady flapping motion; that is, the up and down motion of steady flapping around the midnight region induces kink-like flapping waves, which propagate toward both flanks of the magnetotail

See my research paper: The Distribution of Two Flapping Types of Magnetotail Current Sheet: Implication for the Flapping Mechanism

The geomagnetic field prevents energetic particles, such as galactic cosmic rays, from directly interacting with the Earth’s atmosphere. The geomagnetic field is not static but constantly changing, and over the last 100,000 years, several geomagnetic excursions occurred. 

 Our results provide the possibility to estimate the cosmogenic isotope production rate and cosmic radiation dose rate covering the last 100,000 years according to the best current knowledge about geomagnetic field evolution, and will be useful in further long-term solar activity and climate change reconstruction.