Name: Sunspot formation: theory, simulations and observations
Start: 2015-03-09T09:00:00+01:00
End: 2015-03-13T18:30:00+01:00
Location: Albanova, Stockholm

Sunspot formation: theory, simulations and observations

from Monday, March 9, 2015 (9:00 AM) to Friday, March 13, 2015 (6:30 PM)

Monday, March 9, 2015

8:00 AM Registration
Registration
8:00 AM - 9:00 AM
Room: Albanova entrance, 5th floor
9:00 AM
9:00 AM - 10:40 AM
Room: Oskar Klein Auditorium
Contributions

9:00 AM Global properties of the Sun's magnetic field - Karel Schrijver (Lockheed Martin Advanced Technology Center)

9:40 AM Study of sunspot group evolution on a large statistical sample - Judit Muraközy (Heliophysical Observatory of Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences)

10:00 AM Solar cycle properties from Schwabe data - Senthamizh Pavai Valliappan (Leibniz Institute for Astrophysics)

10:20 AM Understanding stellar cycle and noise to search for Earth-like exoplanets - Fabio Del Sordo (NoRDITA/Yale University)
10:40 AM Coffee break
Coffee break
10:40 AM - 11:10 AM
Room: 4th floor
11:10 AM
11:10 AM - 1:10 PM
Room: Oskar Klein Auditorium
Contributions

11:10 AM Flows in the Convection Zone with Potential Relevance to the Sunspot Problem. - Thomas Duvall (MPS Gottingen)

11:50 AM The radial gradient of the near-surface shear layer of the Sun - Atefeh Barekat (Max-Planck-Institut für Sonnensystemforschung (MPS))

12:10 PM Prediction of solar activity (Wolf numbers) based on nonlinear dynamo - Nathan Kleeorin (Ben-Gurion University of the Negev)

12:40 PM Helicity observations as a constraint of dynamo models - Mei Zhang (National Astronomical Observatory of China)
1:10 PM Lunch
Lunch
1:10 PM - 2:30 PM
Room: Cafeteria (3th floor)
2:30 PM
2:30 PM - 3:40 PM
Room: Oskar Klein Auditorium
Contributions

2:30 PM One Model Doesn't Fit All: Recent Results of a Detailed Analysis of Sunspot Demographics - Andres Munoz-Jaramillo (Montana State University)

3:10 PM Emergence and Decay of Sunspots Groups Observed with HMI - Aimee Norton (Stanford University)
3:40 PM Coffee break
Coffee break
3:40 PM - 4:10 PM
Room: 4th floor
4:10 PM
4:10 PM - 6:00 PM
Room: Oskar Klein Auditorium
Contributions

4:10 PM Small-scale emerging flux and local dynamo action - Irina Kitiashvili (NASA Ames Research Center)

4:50 PM Joy's law revisited by using the new Debrecen tilt angle database - András Ludmány (MTA Debrecen Heliophysical Observatory)

5:10 PM Discussion on the topics of the first day - Rainer Arlt
6:00 PM Wine & Cheese
Wine & Cheese
6:00 PM - 8:00 PM
Room: 4th floor
Tuesday, March 10, 2015
9:00 AM
9:00 AM - 10:20 AM
Room: Oskar Klein Auditorium
Contributions

9:00 AM Towards understanding the subsurface structure of sunspots - Hannah Schunker (Max Planck Institute for Solar System Research)

9:40 AM Properties of sunspot formation as seen from high-resolution observations - Nazaret Bello Gonzalez (Kiepenheuer-Institut fuer Sonnenphysik)

10:00 AM Examining the relationship between buoyant velocity and magnetic field of an emerging active region - Chia-Hsien Lin (National Central University)
10:20 AM Coffee break
Coffee break
10:20 AM - 10:50 AM
Room: 4th floor
10:50 AM
10:50 AM - 11:30 AM
Room: Oskar Klein Auditorium
Contributions

10:50 AM Flux emergence: simulations and observations - Bob Stein (Michigan State University)
11:30 AM
11:30 AM - 1:00 PM
Room: Oskar Klein Auditorium
Contributions

11:30 AM Emerging flux in a Solar-like Convective Dynamo - Yuhong Fan (NCAR)

12:10 PM Scrutinizing the transport of magnetic flux from the tachocline to the surface of solar-like stars. - Yori Fournier (Leibniz Institute for Astrophysics)

12:30 PM Global solar dynamo simulation with and without tachocline: a quest for the dynamo location - Gustavo Guerrero (Universidade Federal de Minas Gerais)
1:00 PM Lunch
Lunch
1:00 PM - 2:30 PM
Room: Cafeteria (3th floor)
2:30 PM
2:30 PM - 4:10 PM
Room: Oskar Klein Auditorium
Contributions

2:30 PM High resolution calculations of solar global convection and dynamo - Hideyuki Hotta (HAO/NCAR)

3:10 PM Understanding the equatorward migration of the Sun’s magnetic field - Jörn Warnecke (Max-Planck-Institut für Sonnesystemforschung)

3:30 PM Grand minima of sunspots and dynamo models - Bidya Binay Karak (Nordita)

3:50 PM Magnetic coupling of the solar atmosphere and the role of sunspots - Rohan Eugene Louis (Leibniz Institute for astrophysics (AIP))
4:10 PM Coffee break
Coffee break
4:10 PM - 4:40 PM
Room: 4th floor
4:40 PM
4:40 PM - 6:10 PM
Room: Oskar Klein Auditorium
Contributions

4:40 PM Near surface effects relevant to sunspot formation. - Robert Cameron (Max Planck Institute for Solar System Research)

5:20 PM MHD simulations of sunspots and starspots with MURaM - Benjamin Beeck (Max Planck Institute for Solar System Research)

5:40 PM Non-LTE Calculation of Sunspot Spectra Based on Optically-Thick Semiempirical Modeling. - Eugene Avrett (Center for Astrophysics)
Wednesday, March 11, 2015
9:00 AM
9:00 AM - 10:10 AM
Room: Oskar Klein Auditorium
Contributions

9:00 AM A Fast-Moving Wave Implying Acoustic Wave Sources Beneath Sunspots Surface - Junwei Zhao (Stanford University)

9:40 AM MHD Waves and Directional Effects in Sunspots - Paul Cally (Monash University)
10:10 AM Coffee break
Coffee break
10:10 AM - 10:40 AM
Room: Oskar Klein Auditorium
10:40 AM
10:40 AM - 1:00 PM
Room: Oskar Klein Auditorium
Contributions

10:40 AM Flows associated with emerging active regions - Aaron Birch (Max Planck Institute for Solar System Research)

11:20 AM A HEK survey of flows around sunspots - Neal Hurlburt (Lockheed Martin Solar & Astrophysics Laboratory)

11:50 AM Effects of rotation and stratification on magnetic flux concentrations - Illa Rivero Losada

12:10 PM Bipolar region formation in stratified two-layer turbulence - Jörn Warnecke (Max-Planck-Institut für Sonnesystemforschung)

12:30 PM Magnetic field concentrations from convection simulations - Petri Käpylä (University of Helsinki)
1:00 PM Lunch
Lunch
1:00 PM - 2:30 PM
Room: Cafeteria (3th floor)

2:30 PM Free time
Free time
2:30 PM - 4:30 PM
Room: City

4:30 PM Conference dinner with boat trip
Conference dinner with boat trip
4:30 PM - 8:30 PM
Room: Gamla Stan
Thursday, March 12, 2015
9:00 AM
9:00 AM - 10:10 AM
Room: Oskar Klein Auditorium
Contributions

9:00 AM Time-distance helioseismology of emerging active regions - Alexander Kosovichev (New Jersey Institute of Technology)

9:30 AM Fanning out of the f-mode in presence of nonuniform magnetic fields - Nishant Singh (Nordita)

9:50 AM Atmospheric seismology of solar active regions - Aneta Wisniewska (Kiepenheuer-Institut fuer Sonnenphysik)
10:10 AM Coffee break
Coffee break
10:10 AM - 10:40 AM
Room: 4th floor
10:40 AM
10:40 AM - 1:00 PM
Room: Oskar Klein Auditorium
Contributions

10:40 AM Intense bipolar structures from dynamo simulations - Dhrubaditya Mitra

11:10 AM Formation of intense bipolar regions in spherical dynamo simulations with stratification - Sarah Jabbari (PhD student)

11:30 AM Theories of sunspots formation: state of the art - Igor Rogachevskii (Ben-Gurion University of the Negev)

12:00 PM Discussion session: Local flux concentration - Robert Cameron
1:00 PM Lunch
Lunch
1:00 PM - 2:30 PM
Room: Cafeteria (3th floor)
2:30 PM
2:30 PM - 3:00 PM
Room: Oskar Klein Auditorium
Contributions

2:30 PM Clustering of Flares and Clustering of Sunspots - Alan Title (Stanford Lockheed Institute)
3:15 PM Albanova colloquium: Zooming in on star and protoplanetary disk formation - Åke Nordlund
Albanova colloquium: Zooming in on star and protoplanetary disk formation
- Åke Nordlund
3:15 PM - 4:15 PM
Room: Oskar Klein Auditorium daptive mesh refinement (AMR) simulations with the RAMSES code allow us to zoom in to sub-AU scales from Giant Molecular Cloud (GMC) outer scales (~ 40pc). With grid sizes down to ~100 AU (16 levels of factor 2 refinement) we can follow supernova driving of star formation over Myr time scales. With 22 level of refinement we can follow the accretion history of individual stars over ~100 kyr with grid sizes down to ~2 AU, and with 29 levels of refinement we can study the dynamics of accretion disks with jets and disk winds over time scales ~100 yr, with grid sizes down to ~0.015 AU. We are currently implementing AMR radiative energy transfer and non-equilibrium chemistry with dust in the RAMSES code, and also developing a new moving-mesh AMR code (DISPATCH), intended for the near future era of exa-scale computing.
4:15 PM Coffee break
Coffee break
4:15 PM - 4:45 PM
Room: 4th floor
4:45 PM
4:45 PM - 5:45 PM
Room: Oskar Klein Auditorium
Contributions

4:45 PM Penumbra formation - Rolf Schlichenmaier (Kiepenheuer-Institut fuer Sonnenphysik)

5:25 PM Peeking at small-scale convection in sunspot penumbrae with high-resolution spectropolarimetry - Sara Esteban Pozuelo (Instituto de Astrofísica de Andalucía (IAA-CSIC))
Friday, March 13, 2015
9:00 AM
9:00 AM - 10:20 AM
Room: Oskar Klein Auditorium
Contributions

9:00 AM On the penumbra - Evershed flow - moat connection: A modeling perspective - Matthias Rempel (HAO/NCAR)

9:40 AM On sunspots and penumbrae - Åke Nordlund

10:00 AM Physical properties of a sunspot chromosphere with umbral flashes - Jaime de la Cruz Rodriguez (Institute for Solar Physics, Stockholm University)
10:20 AM Coffee break
Coffee break
10:20 AM - 10:50 AM
Room: 4th floor
10:50 AM
10:50 AM - 11:50 AM
Room: Oskar Klein Auditorium
Contributions

10:50 AM SST observations and interpretations of penumbral fine structure - Göran Scharmer (Kungliga Vetenskapsakademien)

11:10 AM Observational Diagnostics of Magnetoconvection in a Sunspot Umbra - Nikola Vitas (Instituto de Astrofísica de Canarias)

11:30 AM Single sunspot structures and dynamics from the SOT (Hinode) and AIA (SDO) observations - Serge Koutchmy (Institut d'Astrophysique de Paris CNRS & UPMC)
12:00 PM Lunch
Lunch
12:00 PM - 1:00 PM
Room: Oskar Klein Auditorium
1:00 PM
1:00 PM - 3:00 PM
Room: Oskar Klein Auditorium
Contributions

1:00 PM What causes downflows in magnetic flux concentrations? - Axel Brandenburg (Nordita)

1:20 PM Coherent Picture of Solar Activity - Mark Cheung (Lockheed Martin Solar & Astrophysics Laboratory)
3:00 PM Coffee break
Coffee break
3:00 PM - 3:30 PM
Room: 4th floor

3:30 PM BBQ!
BBQ!
3:30 PM - 5:30 PM
Room: Outside Albanova