Home > Solar and Space Plasma (SSP) Seminar | その他 | 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 > 2022.5.16-2022.5.22


MAY 17 Tue 10:00~11:30  太陽系小天体セミナー / Solar System Minor Body Seminar zoom

MAY 18 Wed 10:30~12:00  SOKENDAI Colloquium   zoom

MAY 18 Wed 15:30~17:00  NAOJ Science Colloquium    zoom

MAY 20 Fri 13:30~15:00 Solar and Space Plasma Seminar zoom

MAY 21 Sat 15:30~17:00  総研大物理科学研究科天文科学専攻 入試ガイダンス2022 / SOKENDAI admission guidance 2022    zoom






Seminar:SOKENDAI Colloquium
Regularly Scheduled/Sporadic:Regular
Date and time:May 18th , 2022 10:30-12:00

Speaker 2: Shun Ishigami
Affiliation: SOKENDAI 2nd year (M2) (Supervisor: Hirohisa Hara, Yukio Katsukawa, Masahito Kubo)
Title: Study of the solar corona heating mechanism using Hinode/EIS

-Name:Matsuda, Graduate Student Affairs Unit


Seminar:NAOJ Science Colloquium
Regularly Scheduled/Sporadic:Every Wednesday
Date and time:2022 May 18, 15:30-17:00
Place:zoom / Instrument Development Bldg. 3 (hybrid)
Speaker:Jian Jiang
Title:Transients with fast brightness variance in UV/optical wavelengths (”fast transients,” such as early-phase supernovae, fast blue optical transients, kilonovae) are of great interest in time-domain astronomy. Although great progresses in time-domain astronomy have been made via wide, shallow, and day(s)-cadence surveys, the limited observing depth and low time resolution make traditional time-domain surveys hard for fast-transient studies. In this talk, I will focus on our previous/ongoing studies of early-phase supernovae and fast blue optical transients via deep (Subaru/HSC) and high-cadence (Kiso/Tomo-e) wide-field surveys. As one of the most powerful time-domain survey facilities in the 2020s, I will also briefly talk about the upcoming Chinese 2.5m Wide-field Survey Telescope (WFST) project.

-Name:Akimasa Kataoka


Campus: Mitaka
Seminar: Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic: Scheduled
Date and time:20 May (Fri), 13:30-15:00
Place: hybrid, Subaru Building / Insei Seminar Room and Zoom
Speaker:Yuta Notsu
Affiliation:CU Boulder/LASP/NSO/Tokyo Tech
Title:Recent observational studies of stellar flares :
For connecting stellar magnetism and planetary environments
Flares are frequent energetic explosions in the stellar atmosphere, and are thought to occur by impulsive releases of magnetic energy stored around starspots.
Large flares (so called “superflares”) generate strong high energy X+UV emissions and coronal mass ejections (CMEs), which can greatly affect the planetary environment and habitability. Recent Kepler/TESS photometric data have revealed the statistical properties of superflares on G, K, M-type stars.
Superflare stars are well characterized by the existence of large starspots on the surface, and their magnetic fluxes can explain well superflare energies. Flare frequency/energy depends on stellar rotation period and stellar temperature. Young rapidly-rotating stars and cooler stars tend to have frequent flares, which can be more “hazardous” for the habitable planets. However, we still do not know the emission mechanisms of superflares, and how large CMEs are associated with superflares on these active stars. Then recently, these active superflare stars have been investigated in more detail through recent multi-wavelength surveys. For example, Hydrogen chromospheric lines during flares show blue-shifted profiles, which can give us some hints on dynamics or mass ejections during superflares.

In the early part of this talk, I briefly overview the recent statistical results of superflares from Kepler/TESS data. Then in the latter part, I also briefly discuss the results of recent multi-wavelength campaign observations of superflares,
and discuss possible detections of mass ejections (stellar CMEs).

-Name:Takayoshi oba
Comment:in English


セミナー名:総研大物理科学研究科天文科学専攻 入試ガイダンス2022 / SOKENDAI admission guidance 2022
日時: 2022年5月21日(土曜日) 10:00~17:00
場所: オンラインまたはハイブリッド開催 ※事前登録制
詳細: https://guas-astronomy.jp/Applicants/nyusi-guidance.html

-名前: 田中 賢幸、中西 康一郎、瀧脇 知也

Home > Solar and Space Plasma (SSP) Seminar | その他 | 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 > 2022.5.16-2022.5.22

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