Article, 2024

Observation of Alfvén Wave Reflection in the Solar Chromosphere: Ponderomotive Force and First Ionization Potential Effect

Physical Review Letters, ISSN 0031-9007, 1079-7114, Volume 132, 21, Page 215201, 10.1103/physrevlett.132.215201

Contributors

Murabito, Mariarita [1] Stangalini, Marco 0000-0002-5365-7546 [2] Laming, John Martin 0000-0002-3362-7040 [3] Baker, Deborah 0000-0002-0665-2355 [4] To, Andy S H 0000-0003-0774-9084 [4] Long, David M 0000-0003-3137-0277 [5] Brooks, David Hamilton 0000-0002-2189-9313 [6] Jafarzadeh, Shahin 0000-0002-7711-5397 [7] [8] Jess, David B 0000-0002-9155-8039 [5] [9] Valori, Gherardo 0000-0001-7809-0067 [8]

Affiliations

  1. [1] Astronomical Observatory of Capodimonte
    2. [NORA names: Italy; Europe, EU; OECD];
  2. [2] Agenzia Spaziale Italiana
    3. [NORA names: Italy; Europe, EU; OECD];
  3. [3] United States Naval Research Laboratory
    4. [NORA names: United States; America, North; OECD];
  4. [4] University College London
    5. [NORA names: United Kingdom; Europe, Non-EU; OECD];
  5. [5] Queen's University Belfast
    6. [NORA names: United Kingdom; Europe, Non-EU; OECD];

Abstract

We investigate the propagation of Alfvén waves in the solar chromosphere, distinguishing between upward and downward propagating waves. We find clear evidence for the reflection of waves in the chromosphere and differences in propagation between cases with waves interpreted to be resonant or nonresonant with the overlying coronal structures. This establishes the wave connection to coronal element abundance anomalies through the action of the wave ponderomotive force on the chromospheric plasma, which interacts with chromospheric ions but not neutrals, thereby providing a novel mechanism of ion-neutral separation. This is seen as a "first ionization potential effect" when this plasma is lifted into the corona, with implications elsewhere on the Sun for the origin of the slow speed solar wind and its elemental composition.

Keywords

Alfven wave reflection, Alfven waves, First, Solar, abundance anomalies, action, anomalies, cases, chromosphere, chromospheric ions, chromospheric plasma, composition, corona, coronal structures, differences, downward propagating waves, effect, element abundance anomalies, elemental composition, evidence, first ionization potential effect, force, ion-neutral separation, ions, mechanism, neutralization, observations, origin, overlying coronal structures, plasma, ponderomotive force, potential effects, propagating waves, propagation, propagation of Alfven waves, reflection, reflection of waves, separation, slow speed solar wind, solar chromosphere, solar wind, speed solar wind, structure, wave, wave reflection, wind

Funders

  • Federal Ministry for Economic Affairs and Climate Action
  • National Aeronautics and Space Administration
  • The Research Council of Norway
  • Royal Society
  • Agenzia Spaziale Italiana
  • United Kingdom Space Agency
  • Leverhulme Trust
  • United States Naval Research Laboratory
  • Science and Technology Facilities Council
  • Japan Aerospace Exploration Agency

Data Provider: Digital Science

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