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  On the nature of the magnetic and electric field fluctuations at ion and electron scales in the near-Sun solar wind

Franci, L., Papini, E., Del Sarto, D., Micera, A., Stawarz, J., Horbury, T., Lapenta, G., Lewis, H., Landi, S., Hellinger, P., Matteini, L., Innocenti, M. E. (2023): On the nature of the magnetic and electric field fluctuations at ion and electron scales in the near-Sun solar wind, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4378

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021809 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021809_1
Genre: Conference Paper

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 Creators:
Franci, Luca1, Author
Papini, Emanuele1, Author
Del Sarto, Daniele1, Author
Micera, Alfredo1, Author
Stawarz, Julia1, Author
Horbury, Tim1, Author
Lapenta, Giovanni1, Author
Lewis, Harry1, Author
Landi, Simone1, Author
Hellinger, Petr1, Author
Matteini, Lorenzo1, Author
Innocenti, Maria Elena1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: We investigate the turbulent energy cascade in the near-Sun solar wind by means of a high-resolution fully kinetic simulation initialised with average plasma conditions measured by Parker Solar Probe during its first solar encounter. Our simulation models the electron-scale electric field fluctuations with unprecedented accuracy. This allows us to perform the first detailed analysis of the different terms of the electric field in the generalised Ohm's law (MHD, Hall, and electron pressure terms) at ion and electron scales, both in physical space and in Fourier space. Such analysis suggests rewriting the Ohm’s law in a different form, which disentangles the contribution of different underlying plasma mechanisms in each range of scales. This provides a new insight on how energy in the turbulent electromagnetic fields is transferred through ion and electron scales and seems to favour the role of pressure-balanced structures versus waves. We finally test our assumptions and numerical results by analysing measurements of the magnetic field, electric field, and ion and electron velocity distributions and their moments performed by Solar Orbiter and Parker Solar Probe. Preliminary results show a remarkable agreement with our theoretical expectations inspired by our simulations.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-4378
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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