My research interest

Solar interior dynamics/ Solar Activity/ Local Helioseismology

In my Ph.D. course at Grad. Univ. Advanced Studies / NAOJ ... Helioseismology

In my master course at Kyoto Univ. ... Solar physics (observational study)

Papers

• "Detection of Supergranulation Alignment in Polar Regions of the Sun by Helioseismology"
  Kaori Nagashima, Junwei Zhao, Alexander G. Kosovichev, Takashi Sekii
  2011, ApJ, 726, L17 (ADS abstract, preprint:arXiv:1011.1025 [astro-ph.SR])
• "Helioseismic Signature of Chromospheric Downflows in Acoustic Travel-time Measurements from Hinode"
  Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Junwei Zhao, Theodore D. Tarbell
  2009, ApJ, 694, L115-L119 (ADS abstract, preprint: arXiv:0903.1323 [astro-ph.SR])
• "Observations of Sunspot Oscillations in G Band and Ca II H Line with Solar Optical Telescope on Hinode"
  Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Hiromoto Shibahashi, Saku Tsuneta, Kiyoshi Ichimoto, Yukio Katsukawa, Bruce Lites, Shin'ichi Nagata, Toshifumi Shimizu, Richard A. Shine, Yoshinori Suematsu, Theodore D. Tarbell, and Alan M. Title
  November 30, 2007, PASJ, 59, (SP3:Hinode special issue), S631-S636 (ADS abstract, preprint : astro-ph/0709.0569)
• "Triggering Mechanism for the Filament Eruption on 2005 September 13 in Active Region NOAA 10808"
  Kaori Nagashima, Hiroaki Isobe, Takaaki Yokoyama, Takako T. Ishii, Takenori J. Okamoto, & Kazunari Shibata
  October 10, 2007, ApJ, 668, 533 (ADS abstract, preprint : astro-ph/0706.3519 )
• "Statistical Study of the Reconnection Rate in Solar Flares Observed with Yohkoh SXT"
  Kaori Nagashima & Takaaki Yokoyama
  August 10, 2006, ApJ, 647, 654 (ADS abstract, preprint : astro-ph/0605712)

Co-author papers

• "Systematic center-to-limb variation in measured helioseismic travel times and its effect on inferences of solar interior meridional flows "
  Junwei Zhao, Kaori Nagashima, R. S. Bogart, A. G. Kosovichev, T. L. Duvall, Jr.
  2012, ApJ, 749, L5 doi:10.1088/2041-8205/749/1/L5 (ADS abstract, preprint:arXiv:1203.1904 [astro-ph.SR])

Proceedings

• "Travel-Time Analyses of an Emerging-Flux Region"
  Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Junwei Zhao, and Theodore D. Tarbell
  ASP Conf. Ser. 415,417-420, 2009, "The Second Hinode Science Meeting: Beyond Discovery -- Toward Understanding"
• "A Statistical Study of the Reconnection Rate in Solar Flares"
  K. Nagashima & T. Yokoyama
  ASP Conf. Ser. 369, 429-432, 2007 "NEW SOLAR PHYSICS WITH SOLAR-B MISSION", The Sixth Solar-B Science Meeting

PhD thesis

• "Local Helioseismology with Solar Optical Telescope onboard Hinode"
  Department of Astronomical Science, the Graduate University for Advanced Studies, Japan
  March, 2010

Master Thesis

• "Observational Studies of Solar Flares: Energy Release Process and Triggering Mechanism"
  Department of Astronomy, Kyoto University, Japan
  March, 2007

Meetings (in English)

in Japanese

First author

ORAL

• 2011/08/17 Center-to-limb variation of acoustic travel times on the Sun
  K. Nagashima
  @LoHCO workshop (Stanford University, Stanford, CA, USA) 2011/08/17-19
• 2010/12/15 S32A-03. Helioseismology Study of Subsurface Dynamics in the Polar Regions of the Sun
  K. Nagashima, J. Zhao, A. G. Kosovichev, T. Sekii
  @2010 AGU Fall meeting (San Francisco, CA, USA) 2010/12/13-17
• 2010/08/02
  • "Hinode helioseismology of supergranules in the polar regions"
    Kaori Nagashima, Junwei Zhao, Alexander G. Kosovichev, Takashi sekii
  • "Horizontal stripes in the time-distance diagram"
    Kaori Nagashima, Tom Duvall, Alexander G. Kosovichev
  • "Statistical property of the cross-correlation functions"
    Kaori Nagashima, Takashi sekii
  @Local Helioseismology Workshop (Stanford, CA, USA) 2010/08/02-06
• 2010/05/27 319.04D (dissertation talk) "Local Helioseismology with Solar Optical Telescope onboard Hinode"
  Kaori Nagashima
  @AAS/SPD 216th Meeting (Miami, FL, USA) 2010/05/23-27
• 2009/12/01 "Local helioseismology of the polar region dynamics by Hinode/SOT"
  Kaori Nagashima, Junwei Zhao, Alexander G. Kosovichev, and Takashi Sekii
  @Hinode-3: The 3rd Hinode Science Meeting (Tokyo, Japan) 2009/12/01-04
• 2008/10/02 T8-3" Travel-time analyses of an emerging-flux region"
  Kaori Nagashima, Takashi Sekii, Alexander G. Kosovichev, Junwei Zhao, Theodore D. Tarbell, Saku Tsuneta
  @Second Hinode Science Meeting (Boulder, CO, USA) 2008/09/29-10/03
• 2007/08/07 "Observations of Sunspot Oscillations from HINODE"
  Kaori Nagashima, Takashi Sekii, A. G. Kosovichev, S. Tsuneta, and Hinode/SOT team
  @Workshop on Time-Distance Helioseismology and Helioseismic Holography (Stanford, CA, USA) 2007/08/06-09
• 2007/07/10 "Distribution of Oscillation Power in NOAA AR 10935 Seen by Hinode/SOT"
  Kaori Nagashima, Takashi Sekii , A. G. Kosovichev, S. Tsuneta, and Hinode/SOT team
  @SOHO19/GONG2007 Seismology of Magnetic Activity (Monash University, Melbourne, Australia) 2007/07/09-13
• 2006/07/13 ST14-11/O4-A1-07 "Statistical analysis of the reconnection rate in solar flares" (oral)
  Kaori Nagashima & Takaaki Yokoyama
  @Asia Oceania Geosciences Society 3rd annual meeting 2006 (Singapore)

POSTER

• 2011/12/09 Poster SH51B-2016 Measuring Acoustic Travel Times in Higher-Latitude Regions of the Sun Using Hinode and SDO Data
  K. Nagashima, J. Zhao, T. Duvall, Jr., A. G. Kosovichev, K. Parchevsky, T. Sekii
  @AGU Fall Meeting 2011 (Moscone Center, San Francisco, California, USA) 2011/12/04-09
• 2011/10/31-11/02 Poster P-45 Multi-wavelength time-distance helioseismology analyses
  K. Nagashima, J. Zhao, T. Duvall, Jr., A. G. Kosovichev, K. Parchevsky, T. Sekii
  @LWS/SDO-3/SOHO-26/GONG-2011 Workshop Solar Dynamics and Magnetism from the Interior to the Atmosphere (Staford University, Stanford, CA, USA) 2011/10/31-11/04
• 2011/10/11-14 Poster P-37 Time-distance helioseismology analyses of multi-wavelength datasets obtained with Hinode/SOT and SDO/HMI
  K. Nagashima, J. Zhao, T. Duvall, Jr., A. G. Kosovichev, K. Parchevsky, T. Sekii
  @Fifth Hinode Science Conference (Royal Sonesta Hotel, Cambridge, Massachusetts, USA) 2011/10/10-15
• 2011/05/02-05 Poster #8 Comparison of Properties of SDO/HMI and Hinode/SOT Helioseismology Datasets
  K. Nagashima, J. Zhao, A. G. Kosovichev, T. Sekii
  @LWS/SDO Workshop (Resort at Squaw Creek, Squaw Valley, CA, USA) 2011/05/01-05
• 2010/05/23-27 400.02 (poster) "Supergranulation in the Polar Regions Observed by Hinode/SOT"
  Kaori Nagashima, Junwei Zhao, Alexander G. Kosovichev, and Takashi Sekii
  @AAS/SPD 216th Meeting (Miami, FL, USA) 2010/05/23-27
• 2008/03/25-28 (poster) "Initial analyses of non-magnetic Dopplergrams obtained by Hinode/SOT"
  K. Nagashima, T. Sekii, A. G. Kosovichev, T. Tarbell, and Hinode/SOT team
  @SDO Science Teams Meeting (Napa, CA, USA) 2008/03/25-08
• 2006/011/14 P1-03 "The trigger mechanism of flares occurred in the most flare-productive active region during　Solar Cycle 23" (poster)
  Kaori Nagashima, Takako T. Ishii, Takenori J. Okamoto, Takaaki Yokoyama, and Kazunari Shibata
  @CAWSES International Workshop on Space Weather Modeling (Yokohama, Japan)
• 2005/11/8-11 P43"A statistical study of the reconnection rate in solar flares" (poster)
  Kaori Nagashima & Takaaki Yokoyama
  @The 6th Solar-B Science Meeting (Kyoto, Japan)