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