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Effect of a Magnetospheric Compression on Jovian Radio Emissions: In Situ Case Study Using Juno Data.

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Title: Effect of a Magnetospheric Compression on Jovian Radio Emissions: In Situ Case Study Using Juno Data.
Authors: Louis, C. K.1,2,3 (AUTHOR) corentin.louis@obspm.fr, Jackman, C. M.1 (AUTHOR), Hospodarsky, G.4 (AUTHOR), O'Kane Hackett, A.1,5 (AUTHOR), Devon‐Hurley, E.1,5 (AUTHOR), Zarka, P.2,3 (AUTHOR), Kurth, W. S.4 (AUTHOR), Ebert, R. W.6,7 (AUTHOR), Weigt, D. M.1,8 (AUTHOR), Fogg, A. R.1 (AUTHOR), Waters, J. E.9 (AUTHOR), McEntee, S. C.1,5 (AUTHOR), Connerney, J. E. P.10 (AUTHOR), Louarn, P.11 (AUTHOR), Levin, S.12 (AUTHOR), Bolton, S. J.6 (AUTHOR)
Source: Journal of Geophysical Research. Space Physics. Sep2023, Vol. 128 Issue 9, p1-15. 15p.
Subject Terms: Magnetopause, Juno (Space probe), Dynamic pressure, Wind pressure, Magnetosphere, Solar wind
Abstract: During its polar orbits around Jupiter, Juno often crosses the boundaries of the Jovian magnetosphere (namely the magnetopause and bow shock). From the boundary locations, the upstream solar wind dynamic pressure can be inferred, which in turn illustrates the state of compression or relaxation of the system. The aim of this study is to examine Jovian radio emissions during magnetospheric compressions, in order to determine the relationship between the solar wind and Jovian radio emissions. In this paper, we give a complete list of bow shock and magnetopause crossings (from June 2016 to August 2022), and the associated solar wind dynamic pressure and standoff distances inferred from Joy et al. (2002, https://doi.org/10.1029/2001JA009146). We then select two sets of magnetopause crossings with moderate to strong compression of the magnetosphere for two case studies of the response of the Jovian radio emissions. We confirm that magnetospheric compressions lead to the activation of new radio sources. Newly activated broadband kilometric emissions are observed almost simultaneously with compression of the magnetosphere, with sources covering a large range of longitudes. Decametric emission sources are seen to be activated more than one rotation later only at specific longitudes and dusk local times. Finally, the activation of narrowband kilometric radiation is not observed until the magnetosphere is in its expansion phase. Key Points: This paper provides a list of the Jovian magnetosphere boundary crossings by the Juno spacecraft from June 2016 to August 2022Jovian magnetospheric compressions lead to increased bKOM radio emissions (immediately) and DAM on the dusk sector (more than one rotation later)nKOM radio emission appears later during relaxation phase of the compression [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: Effect of a Magnetospheric Compression on Jovian Radio Emissions: In Situ Case Study Using Juno Data.
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  Data: <searchLink fieldCode="AR" term="%22Louis%2C+C%2E+K%2E%22">Louis, C. K.</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> corentin.louis@obspm.fr</i><br /><searchLink fieldCode="AR" term="%22Jackman%2C+C%2E+M%2E%22">Jackman, C. M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hospodarsky%2C+G%2E%22">Hospodarsky, G.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22O'Kane+Hackett%2C+A%2E%22">O'Kane Hackett, A.</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Devon‐Hurley%2C+E%2E%22">Devon‐Hurley, E.</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zarka%2C+P%2E%22">Zarka, P.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kurth%2C+W%2E+S%2E%22">Kurth, W. S.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ebert%2C+R%2E+W%2E%22">Ebert, R. W.</searchLink><relatesTo>6,7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Weigt%2C+D%2E+M%2E%22">Weigt, D. M.</searchLink><relatesTo>1,8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fogg%2C+A%2E+R%2E%22">Fogg, A. R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Waters%2C+J%2E+E%2E%22">Waters, J. E.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22McEntee%2C+S%2E+C%2E%22">McEntee, S. C.</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Connerney%2C+J%2E+E%2E+P%2E%22">Connerney, J. E. P.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Louarn%2C+P%2E%22">Louarn, P.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Levin%2C+S%2E%22">Levin, S.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bolton%2C+S%2E+J%2E%22">Bolton, S. J.</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Sep2023, Vol. 128 Issue 9, p1-15. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetopause%22">Magnetopause</searchLink><br /><searchLink fieldCode="DE" term="%22Juno+%28Space+probe%29%22">Juno (Space probe)</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamic+pressure%22">Dynamic pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+pressure%22">Wind pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetosphere%22">Magnetosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink>
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  Data: During its polar orbits around Jupiter, Juno often crosses the boundaries of the Jovian magnetosphere (namely the magnetopause and bow shock). From the boundary locations, the upstream solar wind dynamic pressure can be inferred, which in turn illustrates the state of compression or relaxation of the system. The aim of this study is to examine Jovian radio emissions during magnetospheric compressions, in order to determine the relationship between the solar wind and Jovian radio emissions. In this paper, we give a complete list of bow shock and magnetopause crossings (from June 2016 to August 2022), and the associated solar wind dynamic pressure and standoff distances inferred from Joy et al. (2002, https://doi.org/10.1029/2001JA009146). We then select two sets of magnetopause crossings with moderate to strong compression of the magnetosphere for two case studies of the response of the Jovian radio emissions. We confirm that magnetospheric compressions lead to the activation of new radio sources. Newly activated broadband kilometric emissions are observed almost simultaneously with compression of the magnetosphere, with sources covering a large range of longitudes. Decametric emission sources are seen to be activated more than one rotation later only at specific longitudes and dusk local times. Finally, the activation of narrowband kilometric radiation is not observed until the magnetosphere is in its expansion phase. Key Points: This paper provides a list of the Jovian magnetosphere boundary crossings by the Juno spacecraft from June 2016 to August 2022Jovian magnetospheric compressions lead to increased bKOM radio emissions (immediately) and DAM on the dusk sector (more than one rotation later)nKOM radio emission appears later during relaxation phase of the compression [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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