scholarly journals Simulating Solar Maximum Conditions Using the Alfven Wave Solar-Atmosphere Model (AWSoM)

2021 ◽  
Author(s):  
Nishtha Sachdeva ◽  
Gábor Tóth ◽  
Ward B Manchester ◽  
Bart Van Der Holst ◽  
Zhenguang Huang ◽  
...  
Keyword(s):  
Solar Atmosphere ◽  
Solar Maximum ◽  
Alfven Wave ◽  
Atmosphere Model

scholarly journals Simulating Solar Maximum Conditions Using the Alfvén Wave Solar Atmosphere Model (AWSoM)

2021 ◽  
Vol 923 (2) ◽  
pp. 176
Author(s):  
Nishtha Sachdeva ◽  
Gábor Tóth ◽  
Ward B. Manchester ◽  
Bart van der Holst ◽  
Zhenguang Huang ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Atmosphere ◽  
Solar Maximum ◽  
Initial Conditions ◽  
Magnetic Activity ◽  
Alfven Wave ◽  
Time Of Arrival ◽  
Plasma Parameters ◽  
Modeling Framework ◽  
Atmosphere Model

Abstract To simulate solar coronal mass ejections (CMEs) and predict their time of arrival and geomagnetic impact, it is important to accurately model the background solar wind conditions in which CMEs propagate. We use the Alfvén Wave Solar atmosphere Model (AWSoM) within the the Space Weather Modeling Framework to simulate solar maximum conditions during two Carrington rotations and produce solar wind background conditions comparable to the observations. We describe the inner boundary conditions for AWSoM using the ADAPT global magnetic maps and validate the simulated results with EUV observations in the low corona and measured plasma parameters at L1 as well as at the position of the Solar Terrestrial Relations Observatory spacecraft. This work complements our prior AWSoM validation study for solar minimum conditions and shows that during periods of higher magnetic activity, AWSoM can reproduce the solar plasma conditions (using properly adjusted photospheric Poynting flux) suitable for providing proper initial conditions for launching CMEs.

scholarly journals Simulating Solar Maximum Conditions Using the Alfven Wave Solar-Atmosphere Model (AWSoM)

2021 ◽  
Author(s):  
Nishtha Sachdeva ◽  
Gábor Tóth ◽  
Ward B Manchester ◽  
Bart Van Der Holst ◽  
Zhenguang Huang ◽  
...  
Keyword(s):  
Solar Atmosphere ◽  
Solar Maximum ◽  
Alfven Wave ◽  
Atmosphere Model

scholarly journals Simulating Solar Maximum Conditions Using the Alfven Wave Solar-Atmosphere Model (AWSoM)

2021 ◽  
Author(s):  
Nishtha Sachdeva ◽  
Gábor Tóth ◽  
Ward B Manchester ◽  
Bart Van Der Holst ◽  
Zhenguang Huang ◽  
...  
Keyword(s):  
Solar Atmosphere ◽  
Solar Maximum ◽  
Alfven Wave ◽  
Atmosphere Model

scholarly journals Validation of the Alfvén Wave Solar Atmosphere Model (AWSoM) with Observations from the Low Corona to 1 au

2019 ◽  
Vol 887 (1) ◽  
pp. 83 ◽  
Author(s):  
Nishtha Sachdeva ◽  
Bart van der Holst ◽  
Ward B. Manchester ◽  
Gabor Tóth ◽  
Yuxi Chen ◽  
...  
Keyword(s):  
Solar Atmosphere ◽  
Alfven Wave ◽  
Atmosphere Model

scholarly journals Numerical simulations of the lower solar atmosphere heating by two-fluid nonlinear Alfvén waves

2020 ◽  
Vol 639 ◽  
pp. A45
Author(s):  
B. Kuźma ◽  
D. Wójcik ◽  
K. Murawski ◽  
D. Yuan ◽  
S. Poedts
Keyword(s):  
Magnetic Flux ◽  
Numerical Simulations ◽  
Solar Atmosphere ◽  
Flux Tube ◽  
Alfven Waves ◽  
Alfven Wave ◽  
Magnetic Flux Tube ◽  
Alfvén Waves ◽  
Two Fluid ◽  
Lower Solar Atmosphere

Context. We present new insight into the long-standing problem of plasma heating in the lower solar atmosphere in terms of collisional dissipation caused by two-fluid Alfvén waves. Aims. Using numerical simulations, we study Alfvén wave propagation and dissipation in a magnetic flux tube and their heating effect. Methods. We set up 2.5-dimensional numerical simulations with a semi-empirical model of a stratified solar atmosphere and a force-free magnetic field mimicking a magnetic flux tube. We consider a partially ionized plasma consisting of ion + electron and neutral fluids, which are coupled by ion-neutral collisions. Results. We find that Alfvén waves, which are directly generated by a monochromatic driver at the bottom of the photosphere, experience strong damping. Low-amplitude waves do not thermalize sufficient wave energy to heat the solar atmospheric plasma. However, Alfvén waves with amplitudes greater than 0.1 km s−1 drive through ponderomotive force magneto-acoustic waves in higher atmospheric layers. These waves are damped by ion-neutral collisions, and the thermal energy released in this process leads to heating of the upper photosphere and the chromosphere. Conclusions. We infer that, as a result of ion-neutral collisions, the energy carried initially by Alfvén waves is thermalized in the upper photosphere and the chromosphere, and the corresponding heating rate is large enough to compensate radiative and thermal-conduction energy losses therein.

scholarly journals Solar Neutron Observations During the Coming Solar Maximum: A Plan on the Japan-China Collaborative Project

1989 ◽  
Vol 104 (2) ◽  
pp. 173-176
Author(s):  
Kunitomo Sakurai
Keyword(s):  
Solar Atmosphere ◽  
Solar Flares ◽  
Gamma Ray ◽  
Solar Maximum ◽  
High Energy ◽  
Satellite Observations ◽  
Collaborative Project ◽  
Solar Neutron ◽  
The Earth ◽  
Collaborative Program

AbstractNeutrons are sometimes released from solar flares accompanied by generation of high energy protons and other nuclei and some of them occasionally reach the earth before they decay radioactively. Together with the satellite observations on gamma ray and neutron emissions associated with such flares, the ground-based observations of these neutrons give us a clue to understand the possible nuclear interactions of those protons and nuclei with gases ambient in the solar atmosphere. A review is given on the Japan-China collaborative program on the ground-based observations of these neutrons for the coming solar maximum, though there still remain obstacles to be resolved.

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