Koldobskiy, S. A.; Kähkönen, R.; Hofer, B.; Krivova, N. A.; Kovaltsov, G. A.; Usoskin, I. G.: Time Lag Between Cosmic-Ray and Solar Variability: Sunspot Numbers and Open Solar Magnetic Flux. Solar Physics 297, 38 (2022)
Usoskin, I.G.; Solanki, S. K.; Krivova, N. A.; Hofer, B.; Kovaltsov, G.A.; Wacker, L.; Brehm, N.; Kromer, B.: Solar cyclic activity over the last millennium reconstructed from annual 14C data. Astronomy and Astrophysics 649, A141 (2021)
Hofer, B.; Bourdin, P.-A.: Application of the Electromotive Force as a Shock Front Indicator in the Inner Heliosphere. The Astrophysical Journal 878 (1), 30 (2019)
The Planetary Plasma Environments group (PPE) has a strong heritage in the exploration of planetary magnetospheres and space plasma interactions throughout the solar system. It has contributed instruments to several past missions that flew-by or orbited Jupiter (Galileo, Cassini, Ulysses). The PPE participates in the JUICE mission by contributing hardware and scientific expertise to the Particle Environment Package (PEP).
Analyzing the high spatial resolution solar Ca II H and K emission data obtained by the SUNRISE mission and building a model of other stars more active than the Sun
The magnetic field in the solar atmosphere exceeds the geomagnetic field strength by four orders of magnitude. It greatly influences the processes of energy transport within the solar atmosphere, and dominates the morphology of the solar chromosphere and corona. Kinetic energy from convective motions in the Sun can be efficiently stored in magnetic fields and subsequently released - to heat the solar corona to several million degrees or to blast off coronal mass ejections.