This readme.txt file was generated on Aug 24, 2021 by the Data Repository for the U of M (DRUM)


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GENERAL INFORMATION
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1. Title of Dataset: A Numerical Model for Alfven Waves in Jupiter's Magnetosphere  

2. Published date: 2021-08-18

3. Author Information


  Principal Investigator Contact Information
        Name: Robert L Lysak
           Institution: University of Minnesota
           Address: 285-18 Tate Hall, 116 Church St SE, Minneapolis, MN 55455
           Email: lysak001@umn.edu
	   ORCID: 0000-0002-8262-2350

  
4. Information about funding sources that supported the collection of the data: 

NASA 80NSSC20K1269; National Science Foundation AGS-1840891


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SHARING/ACCESS INFORMATION
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1. Licenses/restrictions placed on the data: Attribution-NonCommercial-NoDerivs 3.0 United States http://creativecommons.org/licenses/by-nc-nd/3.0/us/


2. Links to publications that cite or use the data: 

https://doi.org/10.1029/2021JA029886


3. Links to other publicly accessible locations of the data: n/a


4. Recommended citation for the data:  
Lysak, Robert L. (2021). A Numerical Model for Alfven Waves in Jupiter's Magnetosphere. Retrieved from the Data Repository for the University of Minnesota, https://doi.org/10.13020/7vd6-at92. 


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DATA & FILE OVERVIEW
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A numerical code to describe the propagation of Alfven waves in Jupiter's magnetosphere. This code, written in Fortran, is a finite difference, time-domain code that solves Maxwell's equations in a plasma.

1. alfjup3d.f90: Fortran source code

2. alfjup3d.dat: Sample input file

3. alfjupiar.pro: IDL routines to analyze data

4. Input parameters for Alfjup3d.doc: description of input parameters for Alfjup3d.f90

5. IDL routines in alfjupiar.doc: description of IDL routines to analyze data

6. alfjupiar.zip: Zipped directory containing data from the runs with the 3-digit run number

7. alfven speed.png: Diagram of the simulation volume, with colors indicating the logarithm of the Alfven speed in km/s. The inset shows a blowup of the ionospheric Alfven resonator region.

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ABSTRACT
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The ionospheric Alfvén resonator (IAR) is a structure formed by the rapid decrease in the plasma density above a planetary ionosphere. This results in a corresponding increase in the Alfvén speed that can provide partial reflection of Alfvén waves. At Earth, the IAR on auroral field lines is associated with the broadband acceleration of auroral particles, sometimes termed the Alfvenic aurora. This arises since phase mixing in the IAR reduces the perpendicular wavelength of the Alfvén waves, which enhances the parallel electric field due to electron inertia. This parallel electric field fluctuates at frequencies of 0.1-20.0 Hz, comparable to the electron transit time through the region, leading to the broadband acceleration. The prevalence of such broadband acceleration at Jupiter suggests that a similar process can occur in the Jovian IAR. A numerical model of Alfvén wave propagation in the Jovian IAR has been developed to investigate these interactions. This model describes the evolution of the electric and magnetic fields in the low-altitude region close to Jupiter that is sampled during Juno’s perijove passes. In particular, the model relates measurement of magnetic fields below the ion cyclotron frequency from the MAG and Waves instruments on Juno and electric fields from Waves to the associated parallel electric fields that can accelerate auroral particles.