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2017.7.10-7.16


7月 11日(火)13:30~15:00  太陽系小天体セミナー     南棟2階会議室
Jul 11 tue       Solar System Minor Body Seminar Conference Room, South Bldg.2F

7月 12日(水)10:00~12:00  総研大コロキウム       中央棟 講義室 
Jul 12 wed       SOKENDAI colloquium         Lecture Room

7月 12日(水)13:30~14:30  理論コロキウム        コスモス会館会議室
Jul 12 wed       DTA colloquium         Conference Room Cosmos Lodge

7月 14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                         
Jul 14 fri      Solar and Space Plasma Seminar   Student Seminar Room, Subaru Bldg.                 

7月 14日(金)16:00~17:00  国立天文台談話会       大セミナー室                        
Jul 14 fri        NAOJ Seminar             Large Seminar Room                    

詳細は以下をご覧下さい。

7月11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
7月11日(火曜日)13時30分~15時
場所
南棟2階会議室
講演者
匠あさみ

講演者
臼井文彦
所属
神戸大学 惑星科学研究センター

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

7月12日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Irregular
Date and time
July 12 2017, 10:00 -12:00
Place
Lecture Room

Speaker1
Koki Okutomi
Affiliation
SOKENDAI D3 (Supervisor; Yuichi Aso, Raffael Flaminio, Ryutaro Takahashi)
Title
Control of the Vibration Isolation System for Main Mirrors in KAGRA

Speaker2
Moegi Yamamoto
Affiliation
SOKENDAI D2 (Supervisor; Tadayuki Kodama)
Title
Build-up of the red sequence galaxies in clusters at z=0.6-1.3 from HSC-HSC

Speaker3
Satoshi Tanioka
Affiliation
SOKENDAI M2 (Supervisor; Yoichi Aso)
Title
Direct Measurement of Coating Thermal Noise Using Cryogenic
Optical Cavities
Abstract
The optical coatings used in gravitational-wave detectors
constitute the dominant source of thermal noise. This noise is called
coating thermal noise. Coating thermal noise is one of the most
important noise sources in gravitational-wave detectors at most
sensitive frequency range. To reduce this noise, direct measurement is
indispensable. So far, I have performed simulations and developed
optical systems for direct measurement. I will report the current
status.

Facilitator
-Name:Misaki Ando

Comment
TV conference system is available connecting from Nobeyama,
Hawaii, Mizusawa, and Okayama.

7月12日(水)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled
Date and time
July 12th 2017, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Shoko Oshigami
Affiliation
NAOJ, CfCA
Title
Mare volcanism: Mare volcanism: Reinterpretation based on Kaguya Lunar Radar Sounder data
Abstract
(optional)
The Lunar Radar Sounder (LRS) onboard Kaguya (SELENE) detected widespread horizontal reflectors under some nearside maria. Previous studies estimated that the depths of the subsurface reflectors were up to several hundreds of meters and suggested that the reflectors were interfaces between mare basalt units. The comparison between the reflectors detected in the LRS data and surface age maps indicating the formation age of each basalt unit allows us to discuss the lower limit volume of each basalt unit and its space and time variation. We estimated volumes of basalt units in the ages of 2.7 to 3.8 Ga in the nearside maria. The lower limit volumes of the geologic units estimated in this study were on the order of 10^3 to 10^4 km^3. This volume range is consistent with the total amount of erupted lava flows derived from numerical simulations of thermal erosion models of lunar sinuous rille formation and is also comparable to the average flow volumes of continental flood basalt units formed after the Paleozoic and calculated flow volumes of Archean komatiite flows on the Earth. The lower limits of average eruption rates estimated from the unit volumes were on the order of 10 ^5 to 10^ 3 km^3/yr. The estimated volumes of the geologic mare units and average eruption rate showed clear positive correlations with their ages within the same mare basin, while they vary among different maria compared within the same age range. This talk is given in Japanese.
Facilitator
-Name:Tomoya Takiwaki

Comment
in Japanese

7月14日(金)

Campus
Mitaka
Seminar
Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic
Regular
Date and time
14 July (Fri), 13:30-15:00
Place
Student Seminar Room, Subaru Bldg.
Speaker
Wang Shuoyang
Affiliation
The University of Tokyo
Title
Three-dimensional reconnection enhancement due to tearing mode coupling
Abstract
Magnetic reconnection is thought to explain various energy release astronomical activities, such as solar flares. But how to reach fast reconnection in three-dimensional structure remains unsolved. In our previous study, we noticed that when multiple tearing layers coexist in the same sheared current sheet, inflow and outflow of diffusion regions on different tearing layers couple with each other and trigger fast overall reconnection.
In order to have a clear picture of the reconnection enhancement, we simplify the initial condition by perturbing a sheared magnetic field with a pair of rotational-symmetric tearing instabilities. We notice that whenever new tearing layers are activated near the boundary of current sheet, the total reconnection is boosted accordingly. The selection of new tearing modes are mediated by the inner modes that an increase of wavenumber along global guide field is observed. It guarantees a local fast reconnection due to the shorter tearing wavelength. Interactions between tearing layers, which are similar to what we identified in the previous study, are always observed. As a result, magnetic field is transported into the current sheet continuously and participate into global reconnection while reconnection rate is enhanced step-likewise.

Facilitator
-Name:Shin Toriumi

Comment

7月14日(金)

キャンパス
三鷹
セミナー名
国立天文台談話会
定例・臨時の別
定例
日時
7月14日(金) 16:00-17:00
場所
大セミナー室
講演者
Franz Bauer
所属
Pontificia Universidad Catolica de Chile
タイトル
ALMA studies of DSFGs in the Frontier Fields and CDF-S.
Abstract
ALMA’s first 5 years have brought substantial progress toward the study of distant dusty star forming galaxies (DSFGs). I will present results from two ongoing studies: The ALMA Frontier Fields Survey (ALMA-FFs) and the Bright ALMA Survey In the CDF-S (BASIC). ALMA-FFs is a blind shallow 1.1mm survey of the central regions of 6 strong lensing clusters, while BASIC aims to character sources from a deep SCUBA2 imaging campaign. I will present a census of the detected (and undetected) objects and place them in the context of DSFGs studies to date.

連絡先
-名前:矢野 太平

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