scholarly journals Ice Particle Properties Inferred from Aggregation Modelling

2020 ◽  
Author(s):  
Markus Konrad Karrer ◽  
Stefan Kneifel ◽  
Davide Ori ◽  
Christoph Siewert ◽  
Axel Seifert ◽  
...  
Keyword(s):  
Particuology ◽  
2021 ◽  
Author(s):  
Jing Zhang ◽  
Jinshuo Qiao ◽  
Kening Sun ◽  
Zhenhua Wang

Author(s):  
Asmita Bhandare ◽  
Susanne Pfalzner

Abstract Most stars form as part of a stellar group. These young stars are mostly surrounded by a disk from which potentially a planetary system might form. Both, the disk and later on the planetary system, may be affected by the cluster environment due to close fly-bys. The here presented database can be used to determine the gravitational effect of such fly-bys on non-viscous disks and planetary systems. The database contains data for fly-by scenarios spanning mass ratios between the perturber and host star from 0.3 to 50.0, periastron distances from 30 au to 1000 au, orbital inclination from 0∘ to 180∘ and angle of periastron of 0∘, 45∘ and 90∘. Thus covering a wide parameter space relevant for fly-bys in stellar clusters. The data can either be downloaded to perform one’s own diagnostics like for e.g. determining disk size, disk mass, etc. after specific encounters, obtain parameter dependencies or the different particle properties can be visualized interactively. Currently the database is restricted to fly-bys on parabolic orbits, but it will be extended to hyperbolic orbits in the future. All of the data from this extensive parameter study is now publicly available as DESTINY.


Chemosphere ◽  
2021 ◽  
pp. 130763
Author(s):  
Yongsun Jang ◽  
Han-Shin Kim ◽  
Jeong-Hoon Lee ◽  
So-Young Ham ◽  
Jeong-Hoon Park ◽  
...  

1986 ◽  
Vol 17 (3) ◽  
pp. 592-596
Author(s):  
H.D. Seehars ◽  
D. Hochrainer ◽  
M. Spiekermann

2018 ◽  
Vol 333 ◽  
pp. 404-409 ◽  
Author(s):  
Weining Xie ◽  
Yaqun He ◽  
Lili Qu ◽  
Xiaolu Sun ◽  
Xiangnan Zhu

Icarus ◽  
1992 ◽  
Vol 99 (2) ◽  
pp. 302-317 ◽  
Author(s):  
Wayne R. Pryor ◽  
Robert A. West ◽  
Karen E. Simmons ◽  
Mona Delitsky

2021 ◽  
Vol 923 (2) ◽  
pp. 170
Author(s):  
Tereza Ďurovcová ◽  
Jana Šafránková ◽  
Zdeněk Němeček

Abstract Less abundant but still dynamically important solar wind components are the proton beam and alpha particles, which usually contribute similarly to the total ion momentum. The main characteristics of alpha particles are determined by the solar wind source region, but the origin of the proton beam and its properties are still not fully explained. We use the plasma data measured in situ on the path from 0.3 to 1 au (Helios 1 and 2) and focus on the proton beam development with an increasing radial distance as well as on the connection between the proton beam and alpha particle properties. We found that the proton beam relative abundance increases with increasing distance from the Sun in the collisionally young streams. Among the mechanisms suggested for beam creation, we have identified the wave–particle interactions with obliquely propagating Alfvén modes being consistent with observations. As the solar wind streams get collisionally older, the proton beam decay gradually dominates and the beam abundance is reduced. In search for responsible mechanisms, we found that the content of alpha particles is correlated with the proton beam abundance, and this effect is more pronounced in the fast solar wind streams during the solar maximum. We suggest that Coulomb collisions are the main agent leading to merging of the proton beam and core. We are also showing that the variations of the proton beam abundance are correlated with a decrease of the alpha particle velocity in order to maintain the total momentum balance in the solar wind frame.


Sign in / Sign up

Export Citation Format

Share Document