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Resarch Interests

• Dust-plasma interaction in Saturn's E ring
• - Data analysis of Cassini Langmuir Probe
• - Ion modeling of Saturn's inner magnetosphere
• Plasma characteristics in Saturn's ionosphere
• - Modeling of Saturn's mid-latitude ionosphere
• Plasma and dust environment around Enceladus and of its plume
• - Modeling around Enceladus
• - Data analysis of Cassini Langmuir Probe

Peer-Reviewed Publications

• Ye, S. -Y., D. A. Gurnett, W. S. Kurth, T. F. Averkamp, M. Morooka, S. Sakai, and J. -E. Wahlund (2014), Electron density inside Enceladus plume inferred from plasma oscillations excited by dust impacts, J. Geophys. Res. Space Physics, 119, 3373--3380, doi:10.1002/2014JA019861. [Abstract]
• Sakai, S., S. Watanabe, M. W. Morooka, M. K. G. Holmberg, J. -E. Wahlund, D. A. Gurnett, and W. S. Kurth (2013), Dust-plasma interaction through magnetosphere-ionosphere coupling in Saturn's plasma disk, Planet. Space Sci., 75, 11--16, doi:10.1016/j.pss.2012.11.003. [Abstract]
• Sugiyama, K., A. Suzuki, J. Takahashi, T. Nakamura, S. Manabe, S. Sakai, R. Tsurumaki, R. Nakaoka, S. Tatsumi, I. Tani, N. Katoh, T. Umemoto, T. Oshikawa, T. Mikami, K. Kuramoto, Y. -Y Hayashi, Y. Nakagawa, and Center for Planetary Science (2012), A repository for knowledge of planetary science serving by Center for Planetary Science (CPS), Planetary People, 21, 368--376 (in Japanese). [PDF]

Bulletins, Proceedings and Other Publication

• Sakai, S., S. Watanabe. M. Morooka, M. Holmberg, and J. -E. Wahlund (2012), Dust-plasma interaction through the magnetosphere-ionosphere coupling in Saturn's inner magnetosphere, Geophysical bulletin of Hokkaido University, 75, 133--144 (in Japanese).

Presentations in International Conferences

• Sakai, S., T. E. Cravens, N. Omidi, and M. E. Perry, Test particle models of ions in the plume of Enceladus - Interpretation of INMS data, 46th Lunar and Planetary Science Conference, Abstract#1200, The Woodlands Waterway Marriott Hotel and Convention Center, The Woodlands, Texas, USA, 20 March 2015 (oral). [Abstract]
• Cravens, T. E., D. Mitchell, S. Sakai, A. Rahmati, S. Bougher, J. Halekas, and C. Mazelle, Auger electrons in the Martian ionosphere: Model comparisons with MAVEN data, 46th Lunar and Planetary Science Conference, Abstract#2581, The Woodlands Waterway Marriott Hotel and Convention Center, The Woodlands, Texas, USA, 19 March 2015 (poster). [Abstract]
• Sakai, S., T. E. Cravens, S. Pothapragada, and A. Kumar, Velocity and energy distribution of water group ions around the Enceladus plume, American Geophysical Union Fall Meeting, SM51F-4315, Moscone Center, San Francisco, California, USA, 19 December 2014.
• Sakai, S., and S. Watanabe, High-speed flow and high temperature plasma in Saturn's mid-latitude ionosphere, The 40th COSPAR Scientific Assembly, C3.2-0038-14, M. V. Lomonosov Moscow State University, Moscow, Russia, 8 August 2014 (oral).
• Tadokoro, H., Y. Sato, K. Sakaguchi, Y. Akiya, and S. Sakai, Public outreach activities organized by young scientists -Steple of Sgepss-, Asia Oceania Geoscience Society 11th Annual Meeting, IG20-A006, Royton Sapporo Hotel, Sapporo, Japan, 1 August 2014 (oral).
• Sakai, S., and S. Watanabe, High-speed flow and high temperature plasma in Saturn's mid-latitude ionosphere, Asia Oceania Geoscience Society 11th Annual Meeting, PS08-11-A008, Royton Sapporo Hotel, Sapporo, Japan, 28 July 2014 (oral).
• Sakai, S., S. Watanabe, M. W. Morooka, and J. -E. Wahlund, Dust-plasma interaction in Saturn's plasma disk, 41st EPS Conference on Plasma Physics, I2.408, bcc Berlin Congress Center, Berlin, German, 24 June 2014 (oral, invited paper). [Abstract]
• Ye, S. -Y., D. A. Gurnett, W. S. Kurth, T. F. Averkamp, S. Kempf, H. -W. Hsu, S. Sakai, M. Morooka, and J. -E. Wahlund, Cassini RPWS measurement of dust particles in Saturn's magnetosphere, American Geophysical Union Fall Meeting, P41G-1998, Moscone Center, San Francisco, California, USA, 12 December 2013 (poster).
• Engelhardt, I., A. I. Eriksson, J. -E. Wahlund, M. Morooka, and S. Sakai, Plasma structures in the Enceladus plume, European Planetary Science Congress, EPSC2013-945, University College London, London, United Kingdom, 10 September 2013 (poster). [Abstract]
• Sakai, S., M. Morooka, J. -E. Wahlund, and S. Watanabe, Plasma and dust characteristics of the Enceladus plume, European Geosciences Union General Assembly 2013, EGU2013-10101, Austria Center Vienna, Vienna, Austria, 11 April 2013 (poster). [Abstract]
• Sakai, S., M. Morooka, S. Watanabe, and J. Wahlund, Vertical structure and plasma characteristics of the Enceladus plume, American Geophysical Union Fall Meeting, P31C-1901, Moscone Center, San Francisco, California, USA, 5 December 2012 (poster).
• Sakai, S., S. Watanabe, M. W. Morooka, M. K. G. Holmberg, J. -E. Wahlund, D. A. Gurnett and W. S. Kurth, Dust-plasma interaction through magnetosphere-ionosphere coupling in Saturn's plasma disk, European Planetary Science Congress, EPSC2012-433, IFEMA-Feria de Madrid, Madrid, Spain, 25 September 2012 (poster). [Abstract]
• Sakai, S., S. Watanabe, and R. Fujii, Slowing ion by a dust-plasma interaction and ionospheric conductivities in Saturn's plasma disk, Japan Geoscience Union Meeting, PPS02-08, Makuhari Messe, Chiba, Japan, 24 May 2012 (oral). [Abstract]
• Holmberg, M., J. -E. Wahlund, M. Morooka, and S. Sakai, Structure and dynamics of Saturn's inner magnetosphere - Cassini RPWS/LP observations, European Geosciences Union General Assembly 2012, EGU2012-9625, Austria Center Vienna, Vienna, Austria, 26 April 2012 (poster). [Abstract]
• Sakai, S., S. Watanabe, M. Morooka, M. Holmberg, and J. Wahlund, Dust-plasma interaction through the magnetosphere-ionosphere coupling in Saturn's inner magnetosphere, American Geophysical Union Fall Meeting, SM11A-2004, Moscone Center, San Francisco, California, USA, 5 December 2011 (poster). [Abstract]
• Holmberg, M., J. -E. Wahlund, M. Morooka, and S. Sakai, Dust-plasma interaction in the rings of Saturn, Rings 2011, Cornell University, Ithaca, New York, USA, 28 July 2011 (poster).
• Sakai, S., S. Watanabe, M. Morooka, and J. -E. Wahlund, Dust-plasma interaction in Saturn's plasma disk, Japan Geoscience Union Meeting, PPS001-15, Makuhari Messe, Chiba, Japan, 27 May 2011 (oral). [Abstract]
• Sakai, S., S. Watanabe, M. W. Morooka, M. Holmberg, and J. -E. Wahlund, Cassini RPWS/LP observation of ion velocity and modeling in Saturn's plasma disk, Cassini/MAPS Workshop, Historic Inns of Annapolis, Annapolis, Maryland, USA, 29 April 2011 (oral).
• Sakai, S., S. Watanabe, M. Morooka, and J. -E. Wahlund, The slowing ion in Saturn's plasma disk, The International Symposium on Planetary Science, P19, Tohoku University, Sendai, Japan, 9 March 2011 (poster).
• Nakaoka, K., S. Watanabe, and S. Sakai, A photochemical model of Titan's upper atmosphere and ionosphere, The International Symposium on Planetary Science, P20, Tohoku University, Sendai, Japan, 9 March 2011 (poster).
• Sakai, S., S. Watanabe, M. W. Morooka, and J. -E. Wahlund, A dust-plasma interaction in Saturn's E-ring, 5th Alfvén Conference on Plasma Interaction with Non-magnetized Planets/Moons and its Influence on Planetary Evolution, P-52, Hokkaido University, Sapporo, Japan, 5 October 2010 (poster). [Abstract]
• Wahlund, J. -E., M. W. Morooka, M. Holmberg, W. M. Farrell, D. A. Gurnett, W. S. Kurth, A. M. Persoon, S. Sakai, M. Shafiq, and S. Watanabe, Dust-plasma interaction in the Saturn plasma disc & Enceladus' plume, European Planetary Science Congress, EPSC2010-787, Pontifical University of Saint Thomas Aquinas, Rome, Itary, 24 September 2010 (oral). [Abstract]
• Sakai, S., S. Watanabe, M. W. Morooka, and J. -E. Wahlund, Ion speed in the plasma disc observed by RPWS/LP and its relationship to dusty plasma, CASSINI/MAPS Workshop, Observatorie de Paris, Meudon, France, 8 April 2010 (oral).
• Wahlund, J. -E., M. Holmberg, M. W. Morooka, S. Sakai, S. Watanabe, and M. Shafiq, Dust-Plasma Interaction in the E-ring, CASSINI/MAPS Workshop, Observatorie de Paris, Meudon, France, 8 April 2010 (oral).
• Morooka, M. W., J. -E. Wahlund, M. Shafiq, W. M. Farrell, D. A. Gurnett, W. S. Kurth, A. I. Eriksson, M. André, M. Holmberg, and S. Sakai, Dusty Plasma near the Enceladus and the E ring, CASSINI/MAPS Workshop, Observatorie de Paris, Meudon, France, 8 April 2010 (oral).
• Morooka, M., J. Wahlund, M. Shafiq, W. S. Kurth, D. A. Gurnett, W. Farrell, M. Holmberg, and S. Sakai, Dusty Plasma observed in the E-ring and near Enceladus, American Geophysical Union Fall Meeting, SM32B-03, Moscone Convention Center, San Francisco, California, USA, 16 December 2009 (oral). [Abstract]

Presentations in Japanese Conferences

• Sakai, S., and S. Watanabe, Dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling, PCG38-22, JpGU Meeting 2014, Pacifico Yokohama, Yokohama, Japan, 1 May 2014 (oral). [Abstract]
• Sakai, S., and S. Watanabe, Dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling, The seminar for students going on to doctoral course and researchers recieveing a Ph. D., Tohoku University, Sendai, Japan, 19 Februrary 2014 (oral).
• Sakai, S., M. Morooka, J. -E. Wahlund, and S. Watanabe, Height dependences of Enceladus plume observed by Cassini RPWS/LP, 134th. SGEPSS Fall Meeting, R011-04, Kochi University, Kochi, Japan, 4 November 2013 (oral). [Abstract]
• Sakai, S., and S. Watanabe, Plasma density and temperature in Saturn's ionophere, JpGU Meeting 2013, PCG31-20, Makuhari Messe, Chiba, Japan, 23 May 2013 (oral, presented by Prof. Watanabe). [Abstract]
• Sakai, S., and S. Watanabe, Ion speeds estimated from ionospheric plasma density and magnetospheric dust density in Saturn's E ring, 132th. SGEPSS Fall Meeting, B009-08, Sapporo Convention Center, Sapporo, Japan, 22 October 2012 (oral). [Abstract]
• Sugiyama, K, A. Suzuki, T. Nakamura, S. Manabe, S. Sakai, R. Tsurumaki, S. Tatsumi, R. Nakaoka, N. Katoh, I. Tani, T. Umemoto, T. Oshikawa, and Center for Planetary Science, A repository for knowledge of planetary science serving by Center for Planetary Science (CPS), JpGU Meeting 2012, PPS21-P10, Makuhari Messe, Chiba, Japan, 22 May 2012 (poster). [Abstract]
• Murakami, M., M. -Y. Yamamoto, S. Watanabe, Y. Kakinami, S. Sakai, and M. Larsen, Observation of resonance scattering light of Lithium vapor in daytime lower thermosphere, 130th. SGEPSS Fall Meeting, B005-P016, Kobe University, Kobe, Japan, 5 November 2011 (poster). [Abstract]
• Nakaoka, K., S. Watanabe, and S. Sakai, An ion composition model of Titan's upper atmosphere, 130th. SGEPSS Fall Meeting, B009-08, Kobe University, Kobe, Japan, 4 November 2011 (oral). [Abstract]
• Sakai, S., S. Watanabe, M. Morooka, and J. -E. Wahlund, The ion observations from Cassini RPWS/LP around Enceladus' orbit, 130th. SGEPSS Fall Meeting, B011-P003, Kobe University, Kobe, Japan, 4 November 2011 (poster). [Abstract]
• Nakaoka, K., S. Watanabe, and S. Sakai, A modeling of Titan's ionosphere, JpGU Meeting 2011, PCG033-P01, Makuhari Messe, Chiba, Japan, 24 May 2011 (poster). [Abstract]
• Sakai, S., S. Watanabe, M. Morooka, and J. -E. Wahlund, A dust-plasma interaction in Saturn's E-ring, 128th. SGEPSS Fall Meeting, B009-24, Okinawa Municipality Community Hall, Okinawa, Japan, 3 November 2010 (oral). [Abstract]
• Sakai, S., S. Watanabe, M. Morooka, and J. -E. Wahlund, Cassini ion observation and modeling of the Saturnian inner magnetosphere, JpGU Meeting 2010, PCG040-P13, Makuhari Messe, Chiba, Japan, 27 May 2010 (poster). [Abstract]
• Morooka, M., J. -E. Wahlund, M. Shafiq, W. M. Farrell, D. A. Gurnett, W. S. Kurth, A. M. Persoon, M. André, M. Holmberg, S. Sakai, and S. Watanabe, Dusty Plasma near the E-ring and the Enceladus in Saturn's magnetosphere, JpGU Meeting 2010, PEM031-12, Makuhari Messe, Chiba, Japan, 24 May 2010 (oral, invited paper). [Abstract]
• Sakai, S., S. Watanabe, M. Morooka, M. Holmberg, and J. -E. Wahlund, Ion velocity map of Saturn's inner magnetosphere, 126th. SGEPSS Fall Meeting, B009-07, Kanazawa University, Ishikawa, Japan, 27 September 2009 (oral). [Abstract]

Presentations in Other Meetings

International

• Cravens, T. E., A. Rahmati, S. Sakai, D. Mitchell, J. Connerney, J. Halekas et al., Energetic suprathermal electrons in the ionosphere of Mars, MAVEN PSG Meeting, University of California Berkeley Space Science Laboratory, Berkeley, California, USA, 5 March 2015 (oral).
• Sakai, S., Satrun's inner magnetosphere-ionosphere coupling and the relationship with dust-plasma interaction, ISSI International Team Meeting of "Coordinated numerical modelling of the global Jovian and Saturnian systems", Internatioal Space Science Institute, Bern, Switzerland, 7 January 2015 (oral).
• Sakai, S., and S. Watanabe, M-I coupling in Saturn's E ring, Cassini INMS Meeting, The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA, 15 October 2014 (oral).
• Sakai, S., T. E. Cravens, S. Pothapragada, and A. Kumar, Enceladus plume model, Cassini INMS Meeting, The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA, 14 October 2014 (oral).
• Sakai, S., M. Morooka, J. -E. Wahlund, and S. Watanabe, Dust and plasma characteristics of the Enceladus plume, Dust Workshop/Cassini PSG Meeting #60, Uppsala Konsert & Kongress, Uppsala, Sweden, 28 June 2013 (oral).
• Sakai, S., M. Morooka, J. -E. Wahlund, and S. Watanabe, Dust and plasma characteristics of the Enceladus plume, RPWS Team Meeting/Cassini PSG Meeting #60, Ångström Laboratory, Uppsala, Sweden, 24 June 2013 (oral).
• Sakai, S., S. Watanabe, M. W. Morooka, M. K. G. Holmberg, J. -E. Wahlund, D. A. Gurnett and W. S. Kurth, Dust-plasma interaction through magnetosphere-ionosphere coupling in Saturn's plasma disk, Cassini/Saturn Local Meeting, Tohoku University, Sendai, Japan, 21 November 2012 (oral).

Japanese

• Sakai, S., and S. Watanabe, Dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling, The seminar for students going on to doctoral course and researchers recieveing a Ph. D., Tohoku University, Sendai, Japan, 19 Februrary 2014 (oral).
• Sakai, S., S. Watanabe, M. Morooka, M. Holmberg, J. Wahlund, and R. Fujii, Slowing ion by the dust-plasma interaction and magnetosphere-ionosphere coupling in Saturn's inner magnetosphere, The seminar for students going on to doctoral course and researchers recieveing a Ph. D., Tohoku University, Sendai, Japan, 2 April 2012 (oral).

Award

• 130th. SGEPSS Meeting Student Accomplished Presenter,
  The ion observations from Cassini RPWS/LP around Enceladus' orbit, Kobe, November 2011.
• 128th. SGEPSS Meeting Student Presentaion Award (Aurora Medal),
  A dust-plasma interaction in Saturn's E ring, Okinawa, November 2010.

Dissertation

• Studies on dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling: Doctoral thesis, Hokkaido University, March 2014.
• Cassini RPWS/LP observation of ion velocity and modeling of Saturn's inner magnetosphere (pdf, in Japanese): Master thesis, Hokkaido University, March 2011.
• Study on a generation mechanism of Saturnian aurora (pdf, in Japanese): Graduation thesis, Hokkaido University, March 2009.

Presentations in Seminars

• Astrophysics/Space Physics Seminar (2015/02/24): Ion energy distribution and density in the Enceladus plume
• Space Physics Seminar (2014/07/16): Langmuir Probe
• Space Physics Seminar (2014/07/02): Dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling
• Exploration and Observation Unit seminar (2014/05/16): Dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling
• Defense for doctoral thesis (2014/02/04): Studies on dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling
• Pre-exnamination for doctoral thesis (2013/12/16): Studies on dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling
• Exploration and Observation Unit seminar (2013/12/03): Studies on dust-plasma interaction in Saturn's inner magnetosphere and its magnetosphere-ionosphere coupling
• EPnetFaN (2013/10/04): Remote lecture between university and high school
• Exploration and Observation Unit seminar (2013/07/31): Height dependences of Enceladus plume
• IRFU Seminar (2013/02/20): Plasma and dust characteristics of the Enceladus plume (need password)
• IRFU Seminar (2013/02/20): Dust-plasma interaction through magnetosphere-ionosphere coupling in Saturn's plasma disk
• EPnetFaN (2012/12/14): EP network and router
• Exploration and Observation Unit seminar (2012/11/13): Vertical structure and plasma characteristics of the Enceladus plume ~Analysis results of Cassini RPWS/LP~ (need password)
• Summer School for Young Scientist Group of Geomagnetism, Earth, Planets, and Space Sciences (2012/09/03-05):
  Ion modeling in Saturn's ionosphere and magnetosphere[Same field (need password)][Different field (need password)]
• Exploration and Observation Unit seminar (2012/05/31): Slowing ion by dusty plasma and ionosphere in Saturn's inner magnetosphere (need password)
• Exploration and Observation Unit seminar (2012/03/05): Slowing ion by dust-plasma interaction and magnetosphere-ionosphere coupling in Saturn's plasma disk (need password)
• Summer School for Young Scientist Group of Geomagnetism, Earth, Planets, and Space Sciences (2011/09/12-14):
  Dust-plasma interaction in Saturn's plasma disk
• Exploration and Observation Unit seminar (2011/08/02): Dust-plasma interaction in Saturn's plasma disk (need password)
• Information Experiment (6th.) (2011/06/10): The exposition of hardwares and taking apart a PC
• Information Experiment (4th.) (2011/05/13): Shell, Shell script, vi
• MOSIR Meeting (2011/04/13): Remote lecture between university and high school
• Hearing of Master thesis (2011/02/10): Cassini RPWS/LP observation of ion velocity and modeling of Saturn's inner magnetosphere
• EPnetFaN (2010/11/05): Remote class between university and high school
• Exploration and Observation Unit seminar (2010/10/27): A dust-plasma interaction in Saturn's E-ring (only members of our labratory)
• Muroran-Sakae Highschool Hokudai Visit (2010/08/12): What is University !?
• Information Experiment (10th.) (2010/07/02): Network Computing
• Exploration and Observation Unit seminar (2010/06/09): Ion modeling in the Saturnian inner magnetosphere (only members of our laboratory)
• Information Experiment (3rd.) (2010/04/30): Introduction to Linux
• EPnetFaN (2010/03/26): nano
• Rikubetsu training (2010/03/20-21): Mysterious planet "Saturn"
• DM semi (2010/02/18): Cassini ion observation and modeling of the Saturnian inner magnetosphere
• EPnetFaN (2009/10/23): REAL Server Forever...
• Summer School for Young Scientist Group of Geomagnetism, Earth, Planets, and Space Sciences (2009/09/07-09):
  Effects of Enceladus on Saturnian inner magnetosphere
• EPnetFaN (2009/07/24): Activity Reports! Science Festival! EPnetFaN! ~Fliming of lecture as MOSIR~
• DM semi (2009/05/14): Particle environment vicinity of Enceladus and E-ring
• EPnetFaN (2009/05/08): MOSIR Project
• Workshop for graduation 2 (2009/02/02): Study on a generation mechanism of Saturnian aurora
• Workshop for graduation 1 (2008/09/26): Sturcture of Saturnian magnetosphere
• EPnetFaN (2008/09/05): How do you like "SNS" ?
• Remote teaching (2007/11/16, 12/07): Luna Sciences (2) The Luna Orbiter KAGUYA (SELENE);
  Hashima-Kita High School, Ohgaki-Higashi High School

 Last Update 20 Mar. 2015