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2019.05.13-05.19

5月14日(火)13:30~15:00  太陽系小天体セミナー    南棟2階会議室  
May 14 Tue      Solar System Minor Body Seminar  Conference Room, South Bldg.2F

5月15日(水)10:30~12:00   総研大コロキウム       講義室  
May 15 Wed         SOKENDAI colloquium    Lecture Room 

5月15日(水)13:30~15:00  科学研究部コロキウム    開発棟3号館3階会議室  
May 15 Wed      Colloquium of Division of Science  Conference room, Instrument Development Bldg. 3 3F 

5月17日(金)13:30~15:00  太陽天体プラズマセミナー   院生セミナー室    
May 17 Fri      Solar and Space Plasma Seminar  Student Seminar Room, Subaru Bldg.  

5月17日(金)16:00~17:00  国立天文台談話会      大セミナー室  
May 17 Fri          NAOJ Seminar       Large Seminar Room 

詳細は以下をご覧下さい。

5月14日(火)

キャンパス
三鷹
セミナー名
太陽系小天体セミナー
定例・臨時の別
定例
日時
5月14日(火曜日)13時30分~15時
場所
南棟2階会議室

連絡先
 名前:渡部潤一
 備考:テレビ会議またはスカイプによる参加も可

5月15日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
May 15, 2019, 10:30 -12:00

Place
Lecture Room

Speaker
Masaki Yoshida
Affiliation
SOKENDAI 5th year (D3) (Supervisor: Yoshinori Suematsu, Hirohisa Hara, Ryohko Ishikawa)
Title
Linear Polarization in Lyman-α Solar Spicules Observed by CLASP
Abstract(Option):

Speaker
Yuhang Zhao
Affiliation
SOKENDAI 4th year (D2) (Supervisor: Matteo Leonardi, Raffaele Flaminio, Ryutaro Takahashi)
Title
TBD
Abstract(Option):

Facilitator
-Name: Kei Ito
Comment

5月15日(水)

キャンパス
三鷹
セミナー名
科学研究部コロキウム
定例・臨時の別
定例
日時
5 月 15 日(水曜日)13 時 30分 ~ 15 時
場所
Instrument Development Bldg. 3
講演者
Kanji Mori
所属
東京大学, 国立天文台科学研究部
タイトル
Big Bang Nucleosynthesis with Time-dependent Quark Mass
Abstract
The standard Big Bang nucleosynthesis (BBN) model predicts primordial abundances of hydrogen, helium and lithium which are in reasonable agreement with astronomical observations except for 7Li. Recent precise reanalysis of an absorption system along the line-of-sight toward high redshift quasar Q1243+307 has placed tighter observational constraint on the primordial abundance of deuterium. Comparing this observational result with the theoretical prediction allows us to explore possible beyond-standard physics. In particular, the BBN is sensitive to quark mass variations because they change nuclear binding energies. The effect of the quark mass variations on the BBN has been studied, but it was the case ignoring the roles of the 7Be(n, p)7Li resonant reaction which is known to affect the primordial abundance of 7Be. In this talk, I report for the first time that this reaction significantly decreases the abundance of the A=7 nuclear systems when the quark mass variation is negative. This is because the resonance at E=0.33 MeV is found to contribute strongly to the reaction rates at the BBN temperature. I also report that the 7Li abundance significantly decreases if the quark mass is larger than the present value, although this is the conclusion assuming that the resonance energies are independent of the quark mass variation. In order to prove this solution, more careful theoretical studies of the binding energies of the excited states are desirable.

連絡先
Name:Akimasa Kataoka
備考
使用する言語は英語

5月17日(金)

Campus
Mitaka
Seminar
Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic
Regular
Date and time
17 May (Fri), 13:30-15:00
Place
Student Seminar Room, Subaru Bldg.
Speaker
Takuma Matsumoto
Affiliation
NAOJ
Title
Thermal responses in a coronal loop maintained by wave heating mechanisms
Abstract
A full 3-dimensional compressible magnetohydrodynamic (MHD) simulation is conducted to investigate the thermal responses of a coronal loop to the dynamic dissipation processes of MHD waves. When the foot points of the loop are randomly and continuously forced, the MHD waves become excited and propagate upward.
Then, 1-MK temperature corona is produced naturally as the wave energy dissipates.
The excited wave packets become nonlinear just above the magnetic canopy, and the wave energy cascades into smaller spatial scales. Moreover, collisions between counter-propagating Alfv´en wave packets increase the heating rate, resulting in impulsive temperature increases. Our model demonstrates that the heating events in the wave-heated loops can be nanoflare-like in the sense that they are spatially localized and temporally intermittent.

Facilitator
-Name:Masahito Kubo
Comment

5月17日(金)

Campus
Mitaka
Seminar
NAOJ seminar
Regularly Scheduled/Sporadic
Scheduled
Date and time
Fri 17 May 16:00~17:00
Place
Large Seminar Room
Speaker
Renyue Cen
Affiliation
Princeton University
Title
“Computing the Universe: from Intergalactic Medium to Interstellar Medium”
Abstract
This talk will highlight some progress made based on our computational efforts. to understand the dynamics of gas in the universe, from intergalactic through circumgalactic to interstellar medium.
Select observables presented include the Lyman alpha forest, Lyman alpha emitters, Lyman alpha blobs, warm-hot intergalactic medium, escape of Lyman continuum photons from galaxies, spanning a redshift range from z=0 to the epoch of reionization.

Facilitator
-Name:Matsuda, Yuichi

Home > Solar and Space Plasma (SSP) Seminar | 国立天文台談話会 | 太陽系小天体セミナー | 科学研究部コロキウム | 総研大コロキウム > 2019.05.13-05.19

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