Search Publications
Space weather: the solar perspective: An update to Schwenn (2006)
Temmer, Manuela
The Sun, as an active star, is the driver of energetic phenomena that structure interplanetary space and affect planetary atmospheres. The effects of Space Weather on Earth and the solar system is of increasing importance as human spaceflight is preparing for lunar and Mars missions. This review is focusing on the solar perspective of the Space We…
Earth-affecting solar transients: a review of progresses in solar cycle 24
Dumbović, Mateja; Temmer, Manuela; Dissauer, Karin +16 more
This review article summarizes the advancement in the studies of Earth-affecting solar transients in the last decade that encompasses most of solar cycle 24. It is a part of the effort of the International Study of Earth-affecting Solar Transients (ISEST) project, sponsored by the SCOSTEP/VarSITI program (2014–2018). The Sun-Earth is an integrated…
The evolution of the solar wind
Vidotto, Aline A.
How has the solar wind evolved to reach what it is today? In this review, I discuss the long-term evolution of the solar wind, including the evolution of observed properties that are intimately linked to the solar wind: rotation, magnetism and activity. Given that we cannot access data from the solar wind 4 billion years ago, this review relies on…
Solar structure and evolution
Christensen-Dalsgaard, Jørgen
The Sun provides a critical benchmark for the general study of stellar structure and evolution. Also, knowledge about the internal properties of the Sun is important for the understanding of solar atmospheric phenomena, including the solar magnetic cycle. Here I provide a brief overview of the theory of stellar structure and evolution, including t…
Evolution of Switchbacks in the Inner Heliosphere
Velli, Marco; Matteini, Lorenzo; Sioulas, Nikos +3 more
We analyze magnetic field data from the first six encounters of Parker Solar Probe, three Helios fast streams and two Ulysses south polar passes covering heliocentric distances 0.1 ≲ R ≲ 3 au. We use this data set to statistically determine the evolution of switchbacks of different periods and amplitudes with distance from the Sun. We compare the …
Current Sheets, Plasmoids and Flux Ropes in the Heliosphere. Part I. 2-D or not 2-D? General and Observational Aspects
Li, Gang; Bruno, R.; Malandraki, O. +13 more
Recent accumulation of a critical mass of observational material from different spacecraft complete with the enhanced abilities of numerical methods have led to a boom of studies revealing the high complexity of processes occurring in the heliosphere. Views on the solar wind filling the interplanetary medium have dramatically developed from the be…
An Ab Initio Approach to Antiproton Modulation in the Inner Heliosphere
Engelbrecht, N. Eugene; Moloto, K. D.
Recent advances in the detection of cosmic-ray (CR) antiproton intensities at Earth have the potential to provide valuable new insights in the search for dark matter. As such, a fuller understanding of the modulation of these particles due to the influence of the Sun is of vital importance. Valuable insights can be gained through the study of gala…
Threaded-field-line Model for the Low Solar Corona Powered by the Alfvén Wave Turbulence
Jin, Meng; Sokolov, Igor V.; Gombosi, Tamas I. +6 more
We present an updated global model of the solar corona, including the transition region. We simulate the realistic three-dimensional (3D) magnetic field using the data from the photospheric magnetic field measurements and assume the magnetohydrodynamic (MHD) Alfvén wave turbulence and its nonlinear dissipation to be the only source for heating the…
Flux Ropes, Turbulence, and Collisionless Perpendicular Shock Waves: High Plasma Beta Case
Zhao, L. L.; Zank, G. P.; Adhikari, L. +4 more
With the onset of solar maximum and the expected increased prevalence of interplanetary shock waves, Parker Solar Probe is likely to observe numerous shocks in the next few years. An outstanding question that has received surprisingly little attention has been how turbulence interacts with collisionless shock waves. Turbulence in the supersonic so…
Solar wind turbulence: Connections with energetic particles
Oughton, Sean; Engelbrecht, N. Eugene
For the solar wind, a wealth of observational evidence indicates that turbulence is an important dynamical process for velocity (v), magnetic (b), and other related fluctuations at MHD (fluid) scales. Here we review such observations and turbulence features, including discussion of when wave or turbulence descriptions can (or cannot) explain the o…