1月9日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Jan 9 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
1月9日（火）15：00～16：00 国立天文台談話会 大セミナー室
Jan 9 Tue NAOJ Seminar Large Seminar Room
1月9日（火）16：00～17：00 国立天文台談話会 大セミナー室
Jan 9 Tue NAOJ Seminar Large Seminar Room
1月10日（水）10：30～12：00 総研大コロキウム 講義室
Jan 10 Wed SOKENDAI colloquium Lecture Room
1月12日（金）10：30～12：00 赤外ゼミ ALMA棟102室
Jan 12 Fri Infrared Seminar ROOM102 ALMA Bldg.
1月12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
Jan 12 Fri Solar and Space Plasma Seminar Student Seminar Room, Subaru Bldg.
1月12日（金）16：00～17：00 国立天文台談話会 大セミナー室
Jan 12 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
1月9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
- 1月9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
1月9日（火）
- キャンパス
- 三鷹
- セミナー名
- 談話会
- 定例・臨時の別
- 定例
- 日時
- １月９日（火曜日）15時～16時
- 場所
- すばる棟大セミナー室
- 講演者
- Di Li
- 所属
- NAOC
- タイトル
- A Commensal Radio Astronomy FasT Survey (CRAFTS)
- Abstract
- The Five-hundred-meter Aperture Sperical radio Teleacope (FAST) is under commissioning. Its collecting area coupled with its unqiue design promises unprecedented sensitivity and also presents unprecedented chanllenges. I will report our commensal radio astronomy FAST survey
(CRAFTS) plan, which aims to utilize the FAST 19-beam L band array in drift scan mode to carry out pulsar search, HI galaxies survey, HI imaging, and transient search (FRB), simultaneously. CRAFTS will take advantage of the large collecting area while avoid system complications, e.g. self-generated RFI and real time measurement and control of ~1000points. If successful, CRAFTS will cover half the sky in about 220 full-day scans and will provide unprecedented capabilities. The expected data rate is 1.6GB/s and 10 to 20 PB annually. I will report on our current plan in terms of calibration and data processing, which all aspire to preserve as much discovery space as possible for all four science goals. CRAFTS expect to find more than 1000 new pulsars, hundreds of thoudands of galaxies, 10 billion voxels in HI cubes, and a few tens of FRBs. - 連絡先
- -名前：長谷川 哲夫
1月9日（火）
- キャンパス
- 三鷹
- セミナー名
- 談話会
- 定例・臨時の別
- 定例
- 日時
- １月９日（火曜日）16時～17時
- 場所
- すばる棟大セミナー室
- 講演者
- George Hobbs
- 所属
- CSIRO
- タイトル
- Pulsar and transients observations at Parkes and towards the SKA
- Abstract
- I will describe historical and on-going pulsar observing projects with the Parkes telescope. This will include a discussion on the Parkes Pulsar Timing Array (PPTA) project that aims to use pulsars to detect ultra-low-frequency gravitational waves and the various pulsar search projects that had led to Parkes being used to discover more than half of the known pulsars. I will describe how the SKA will be used to search for and study pulsars and highlight various technical challenges relating to the SKA.
- 連絡先
- -名前：長谷川 哲夫
1月10日（水）
- Campus
- Mitaka
- Seminar
- SOKENDAI colloquium
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- January 10, 2018, 10:30 -12:00
- Place
- Lecture Room
- Speaker
- Ananya Sahoo
- Affiliation
- SOKENDAI 3rd year (D1)(Supervisor: Yosuke Minowa,Takayuki Kotani,Naruhisa Takato)
- Title
- An overview of AO188+ SCExAO Wavefront Control Architecture Abstract (if you like):
- Speaker
- Shigeru Namiki
- Affiliation
- SOKENDAI 1st year (M1)(Supervisor: Nobunari Kashikawa,Yusei Koyama,Ikuru Iwata)
- Title
- The environmental Impacts on Mass-Metallicity Relation in Rich Cluster at z~1.52 Abstract (if you like):
Please note that the presenter information posted here is not necessarily listed in order of presentation.
- Facilitator
- -Name：Nagaaki Kambara
- Comment
- TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.
1月12日（金）
- キャンパス
- 三鷹
- セミナー名
- 赤外ゼミ
- 定例・臨時の別
- 定例
- 日時
- 1月12日（金曜日）10:30～12:00
- 場所
- ALMA棟102室
- 講演者
- Yang Yi（総研大）
- タイトル
- Near-Infrared High-Resolution Polarimetry Observations towards Protoplanetary Disks in Binary/Multiple Systems
- 連絡先
- -名前：大宮正士・石川裕之
- 備考
- 後半11:30~12:00には新着論文の情報交換です。
ZOOM、TV会議システムでの参加も可能です。
1月12日（金）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 12 January (Fri), 13:30-15:00
- Place
- Student Seminar Room, Subaru Bldg.
- Speaker
- Takahiro Hasegawa
- Affiliation
- The University of Tokyo, ISAS/JAXA
- Title
- Observational Studies on Magnetic Helicity Associated with Solar Flares
- Abstract
-
Solar flares are release of coronal free energy via magnetic reconnection. Free energy takes a form of complexity of magnetic field in the corona. Magnetic helicity, therefore, is a fundamental physical quantity to describe coronal energetics. Because helicity flux can be derived with evolution of observable photospheric magnetic field, long term magnetic helicity evolution has been studied well to investigate processes of solar flares (Chae et al. 2001; Kusano et al. 2002, etc.).
These studies showed a variety of photospheric features are attributed to helicity build-up, e.g. flux emergence, shearing and braiding motion of magnetic field, sunspot rotation and so on. Some studies reported that magnetic helicity injection whose polarity is opposite to the global helicity has an important role on occurrence of energetic solar flares (Park et al. 2010, 2012).
In this study, we investigate relationships between features of flare occurrence and evolution of magnetic field and helicity through the analysis of AR NOAA 12297 located in the southern hemisphere. This complex active region had 2 flaring region; one produced an X-class flare but few flares larget than M-class, and the other region had 7 M-class flares from 2015 10th 12:00UT to 13th 12:00UT. These 2 regions, however, have a similar configuraion; an emerging flux moving counter-clockwise to a spot. The former region is characterized by negative helicity injection, whose sign is opposite to hemispheric sign preference of helicity (Pevtsov 2002), due to the counter-clockwise rotation of the main sunspot. On the other hand, the significant feature of latter region is fluctuated positive braiding helicity injection between spot and emerging flux. We conclude these features of helicity injection have important roles on determining flaring patterns. - Facilitator
- -Name：Shin Toriumi
- Comment
1月12日（金）
- Campus
- Mitaka
- Seminar
- NAOJ Seminar
- Regularly Scheduled/Sporadic
- Regularly
- Date and time
- 16:00-17:00, Friday, Jan 12
- Place
- Large Seminar Room
- Speaker
- Toshio Fukushima 福島登志夫
- Affiliation
- NAOJ
- Title
- “Study Old and Find New” 自然科学における温故知新のすすめ
- Abstract
-
“Study Old and Find New” is a Confucian advice to beginners. Although it is a general principle, this motto is not so advocated in natural sciences.
Rather, we are told to “Study Now and Find New.” However, the reality is not so simple. Indeed, there exists an educative specimen that a great discovery was delayed to be popularized because nobody did study old.
The well-known FFT (Fast Fourier Transform) was said to be invented by Cooley and Tukey in 1965. Nevertheless, Gauss did propose the exact same method in 1805. An older example is Newton’s cannon ball depicted in Vol. 3 of PRINCIPA, which is nothing but the artificial satellites. Also, Laplace estimated an upper bound of Sun’s density by using the fact that its escape velocity is less than the speed of light. This means that the Sun is never a black hole, which the general theory of relativity was said to have discovered. Then, how can we avoid such a re-invention of the existing but not popular idea? The only solution may be to “Study Old, Study Old, and Study Old”. Fortunately, the development of searching engines as the Google and the spread of free electronic library systems like the Project Gutenberg seem to have improved the situation. Having said so, we must admit that remained is a big
issue: exponentially increasing literature. It might mean that the whole lifetime of a researcher is spent before reaching the cutting-edge.
Is there any other way to resolve this problem than relying on the advancement of the Artificial Intelligence? - Facilitator
- -Name：Noriyuki Narukage
- Comment
- Language : English