[en] We study the auroral emissions equatorward of the main oval based on Hubble Space Telescope (HST) observations of both Jovian hemispheres on September 20, 1997. On the same day, Galileo observed changes in the electron pitch angle distribution between the inner and middle magnetosphere (PAD boundary), indicative of electron diffusion. This region, magnetically maps to the equatorward diffuse emissions on both hemispheres. Whistler mode waves, observed simultaneously, can scatter electrons into the loss cone and lead to electron precipitation in the ionosphere. Based on simultaneous HST FUV and Galileo wave and electron data we test the conditions for electron scattering by whistler mode waves and derive the energy flux precipitated in the ionosphere. The comparison of the derived precipitation energy flux with the observed auroral brightness indicates that the energy contained in the PAD boundary can account for the auroral emissions.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Radioti, Aikaterini ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Tomás, Ana Teresa; GeoForschungZentrum, Potzdam, Germany
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gustin, Jacques ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Bhattacharya, B., R. M. Thome, and D. J. Williams (2001), On the energy source for diffuse Jovian auroral emissivity, Geophys. Res. Lett., 28, 2751-2754.
Bhattacharya, B., R. M. Thome, D. J. Williams, K. K. Khurana, and D. A. Gurnett (2005), Diffuse auroral precipitation in the Jovian upper atmosphere and magnetospheric electron flux variability, Icarus, 178, 406-416.
Clarke, J. X., et al. (1998), Hubble Space Telescope imaging of Jupiter's UV aurora during the Galileo orbiter mission, J. Geophys. Res., 103, 20,217-20,236.
Connerney, J. E. P., M. H. Acuña, N. F. Ness, and T. Satoh (1998), New models of Jupiter's magnetic field constrained by the Io flux tube footprint, J. Geophys. Res., 103, 11,929-11,939.
Cowley, S. W. H., and E. J. Bunce (2001), Origin of the main auroral oval in Jupiter's coupled magnetosphere-ionosphere system, Planet. Space Sci., 49, 1067-1088.
Grodent, D., J. H. Waite Jr., and J.-C. Gérard (2001), A self-consistent model of the Jovian auroral thermal structure, J. Geophys. Res., 106, 12,933-12,952.
Grodent, D., J. T. Clarke, J. Kim, J. H. Waite Jr., and S. W. H. Cowley (2003a), Jupiter's main auroral oval observed with HST-STIS, J. Geophys. Res., 108(A11), 1389, doi:10.1029/2003JA009921.
Grodent, D., J. T. Clarke, J. H. Waite Jr., S. W. H. Cowley, J.-C. Gérard, and J. Kim (2003b), Jupiter's polar auroral emissions, J. Geophys. Res., 108(A10), 1366, doi:10.1029/2003JA010017.
Grodent, D., J.-C. Gérard, A. Radioti, B. Bonfond, and A. Saglam (2008a), Jupiter's changing auroral location, J. Geophys. Res., 113, A01206, doi:10.1029/2007JA012601.
Grodent, D., B. Bonfond, J.-C. Gérard, A. Radioti, J. Gustin, J. T. Clarke, J. Nichols, and J. E. P. Connerney (2008b), Auroral evidence of a localized magnetic anomaly in Jupiter's northern hemisphere, J. Geophys. Res., 113, A09201, doi:10.1029/2008JA013185.
Gustin, J., J.-C. Gérard, D. Grodent, S. W. H. Cowley, J. T. Clarke, and A. Grard (2004), Energy-flux relationship in the FUV Jovian aurora deduced from HST-STIS spectral observations, J. Geophys. Res., 109, A10205, doi:10.1029/2003JA010365.
Home, R. B., R. M. Thome, N. P. Meredith, and R. R. Anderson (2003), Diffuse auroral electron scattering by electron cyclotron harmonic and whistler mode waves during an isolated substorm, J. Geophys. Res., I08(A7), 1290, doi:10.1029/2002JA009736.
Mauk, B. H., J. T. Clarke, D. Grodent, J. H. Waite Jr., C. P. Paranicas, and D. J. Williams (2002), Transient aurora on Jupiter from injections of magnetospheric electrons, Nature, 415, 1003-1005.
Radioti, A., J.-C. Gérard, D. Grodent, B. Bonfond, N. Krupp, and J. Woch (2008), Discontinuity in Jupiter's main auroral oval, J. Geophys. Res., 113, A01215, doi:10.1029/2007JA012610.
Thome, R. M. (1983), Microscopic plasma processes in the Jovian magne-tosphere, in Physics of the Jovian Magnetosphere, edited by A. J. Dessler, pp. 454-488, Cambridge Univ. Press, New York.
Thome, R. M., and B. T. Tsurutani (1979), Diffuse Jovian aurora influenced by plasma injection from Io, Geophys. Res. Lett., 6, 649-652.
Tomás, A. T., J. Woch, N. Krupp, A. Lagg, K.-H. Glassmeier, M. K. Dougherty, and P. G. Hanlon (2004a), Changes of the energetic particles characteristics in the inner part of the Jovian magnetosphere: A topological study, Planet. Space Sci., 52, 491-498.
Tomás, A. X., J. Woch, N. Krupp, A. Lagg, K.-H. Glassmeier, and W. S. Kurth (2004b), Energetic electrons in the inner part of the Jovian magnetosphere and their relation to auroral emissions, J. Geophys. Res., 109, A06203, doi:10.1029/2004JA010405.
Xiao, F., R. M. Thome, D. A. Gurnett, and D. J. Williams (2003), Whistler-mode excitation and electron scattering during an interchange event near Io, Geophys. Res. Lett., 30(14), 1749, doi:10.1029/2003GL017123.
Similar publications
Sorry the service is unavailable at the moment. Please try again later.
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.
