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Influence of the Solar Wind Dynamic Pressure on the Ion Precipitation: MAVEN Observations and Simulation Results.

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Title: Influence of the Solar Wind Dynamic Pressure on the Ion Precipitation: MAVEN Observations and Simulation Results.
Authors: Martinez, A.1 antoine.martinez@latmos.ipsl.fr, Modolo, R.2, Leblanc, F.1, Chaufray, J. Y.1,2, Witasse, O.3, Romanelli, N.4,5, Dong, Y.6, Hara, T.7, Halekas, J.8, Lillis, R.7, McFadden, J.7, Eparvier, F.8, Leclercq, L.9, Luhmann, J.7, Curry, S.7, Jakosky, B.8
Source: Journal of Geophysical Research. Space Physics. Oct2020, Vol. 125 Issue 10, p1-12. 12p.
Subject Terms: *Ionosphere, *Geomagnetism, Solar wind, Charge exchange, Quantitative research
Abstract: We discuss the influence of the solar wind dynamic pressure on the ion precipitation using observations performed by MAVEN from 4 June 2014 to 20 July 2017. The increase of the dynamic pressure from 0.63 to 1.44 nPa is clearly associated with an increase of the same order of magnitude of the precipitating oxygen ion energy flux measured by MAVEN/STATIC from 9.9 to 20.6 × 106 eV · cm−2 · sr−1 · s−1 at low energy (from 30 to 650 eV). In the same way, from 650 to 25,000 eV, MAVEN/SWIA (all species) observed an increase from 22.4 to 42.8 × 107eV · cm−2 · sr−1 · s−1 of the precipitating ion energy flux. Performing two simulations using the average solar wind conditions for both solar dynamic pressure regimes observed by MAVEN as input of the LatHyS model (LATMOS Hybrid Simulation), we reproduce some of the key characteristics of the observed oxygen ion precipitation. We characterize the oxygen ions simulated by LatHyS by their energy and time of impact, their time of injection in the simulation and initial position, and the mechanism by which these ions were created. The model suggests that the main cause of the increase of the heavy ion precipitation during an increase of the solar dynamic pressure is the increase of the ion production by charge exchange, proportional to the increase of the solar wind flux, which becomes the main contribution to the ion precipitation at high energy. Key Points: An increase of the dynamic pressure leads to an increase of the oxygen ion precipitationAt high energy, the main contribution to the oxygen ion precipitation is the ion producted by charge exchangeAt high energy, the increase rate is proportional to that of the solar wind particle flux [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Influence of the Solar Wind Dynamic Pressure on the Ion Precipitation: MAVEN Observations and Simulation Results.
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  Data: <searchLink fieldCode="AR" term="%22Martinez%2C+A%2E%22">Martinez, A.</searchLink><relatesTo>1</relatesTo><i> antoine.martinez@latmos.ipsl.fr</i><br /><searchLink fieldCode="AR" term="%22Modolo%2C+R%2E%22">Modolo, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Leblanc%2C+F%2E%22">Leblanc, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chaufray%2C+J%2E+Y%2E%22">Chaufray, J. Y.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Witasse%2C+O%2E%22">Witasse, O.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Romanelli%2C+N%2E%22">Romanelli, N.</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Dong%2C+Y%2E%22">Dong, Y.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Hara%2C+T%2E%22">Hara, T.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Halekas%2C+J%2E%22">Halekas, J.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Lillis%2C+R%2E%22">Lillis, R.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22McFadden%2C+J%2E%22">McFadden, J.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Eparvier%2C+F%2E%22">Eparvier, F.</searchLink><relatesTo>8</relatesTo><br /><searchLink fieldCode="AR" term="%22Leclercq%2C+L%2E%22">Leclercq, L.</searchLink><relatesTo>9</relatesTo><br /><searchLink fieldCode="AR" term="%22Luhmann%2C+J%2E%22">Luhmann, J.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Curry%2C+S%2E%22">Curry, S.</searchLink><relatesTo>7</relatesTo><br /><searchLink fieldCode="AR" term="%22Jakosky%2C+B%2E%22">Jakosky, B.</searchLink><relatesTo>8</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Oct2020, Vol. 125 Issue 10, p1-12. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Ionosphere%22">Ionosphere</searchLink><br />*<searchLink fieldCode="DE" term="%22Geomagnetism%22">Geomagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+exchange%22">Charge exchange</searchLink><br /><searchLink fieldCode="DE" term="%22Quantitative+research%22">Quantitative research</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We discuss the influence of the solar wind dynamic pressure on the ion precipitation using observations performed by MAVEN from 4 June 2014 to 20 July 2017. The increase of the dynamic pressure from 0.63 to 1.44 nPa is clearly associated with an increase of the same order of magnitude of the precipitating oxygen ion energy flux measured by MAVEN/STATIC from 9.9 to 20.6 × 106 eV · cm−2 · sr−1 · s−1 at low energy (from 30 to 650 eV). In the same way, from 650 to 25,000 eV, MAVEN/SWIA (all species) observed an increase from 22.4 to 42.8 × 107eV · cm−2 · sr−1 · s−1 of the precipitating ion energy flux. Performing two simulations using the average solar wind conditions for both solar dynamic pressure regimes observed by MAVEN as input of the LatHyS model (LATMOS Hybrid Simulation), we reproduce some of the key characteristics of the observed oxygen ion precipitation. We characterize the oxygen ions simulated by LatHyS by their energy and time of impact, their time of injection in the simulation and initial position, and the mechanism by which these ions were created. The model suggests that the main cause of the increase of the heavy ion precipitation during an increase of the solar dynamic pressure is the increase of the ion production by charge exchange, proportional to the increase of the solar wind flux, which becomes the main contribution to the ion precipitation at high energy. Key Points: An increase of the dynamic pressure leads to an increase of the oxygen ion precipitationAt high energy, the main contribution to the oxygen ion precipitation is the ion producted by charge exchangeAt high energy, the increase rate is proportional to that of the solar wind particle flux [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2020JA028183
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        Text: English
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      – SubjectFull: Ionosphere
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      – SubjectFull: Solar wind
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