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GREGOR Meetings
2nd GREGOR Science Meeting Free Conference is closed
Conference is closed
gregor16
Hosted by Markus Roth
Affiliation Kiepenheuer-Institut fuer Sonnenphysik
Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany
06.11.2016 - 08.11.2016

Organizing institutions
Max-Planck-Institut für Sonnensystemforschung
Main category Natural Sciences (Astrophysics and Astrononmy)
Conference/Workshop objectives

This is the 2nd GREGOR Science Meeting.
The meeting will be held at MPS in Göttingen from Tuesday morning (Nov-08 2016, 09:30) and end on Wednesday noon.

The latest version of the program can be found here:
https://docs.google.com/spreadsheets/d/1I15XSEsc8YoxxVGRUtBgYCWNXWuHPVeAJBUAAWtHxNo/pub?gid=377886684&single=true&output=pdf

Local organizing committee
Andreas Lagg
Scientific organizing committee (SOC)

Andreas Lagg
Oskar von der Lühe
Rolf Schlichenmaier

Sessions
  • EST Session
  • GREGOR Executive Meeting
  • Science
  • Current Status and Infromation
Programme
Invited speakers

Speakers at the meeting are:

Meetu Verma
Carlos José Díaz Baso
Tobías Felipe
Sergio González
Alessandro Cilla
Carsten Denker
Christoph Kuckein
Hanna Strecker
David Orozco
Franz Kneer
Catherine Fischer
Michele Bianda
Morten Franz
Oskar von der Lühe
Horst Balthasar
Andreas Lagg
Andrés Asensio Ramos
Hans-Peter Doerr
Michiel van Noort
Carsten Denker
Sebastian Hoch
Dirk Soltau
Thomas Berkefeld

Important dates None.
Registration and payment information

We will charge a meeting fee of EUR 30.- for external visitors.
This will include the coffee breaks and the lunch on Tuesday.
We ask you to pay the fee in cash during the meeting.

Conference venue Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany
Hotel information

Please have a look at the map
https://goo.gl/maps/QeEvi
to see the positions of possible hotels (and of bus stops).

If you decide to stay in one of the hotels tell the people that you have a meeting at a Max Planck Institute in order to get a discount.

Travel information If you need help for your travel arrangements please contact Sibylla (siebert-rust@mps.mpg.de).
There are no uploaded videos yet.
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Andreas Lagg

Session: Science

502 views
Date of upload:
09.11.2016
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Abstract:
n/a
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David Orozco Suarez

Session: Science

480 views
Date of upload:
11.11.2016
Co-author:
Abstract:
Determining empirical atmospheric models for the solar chormosphere is difficult since it requires the observation and analysis of spectral lines that are affected by non-local termodynamic equilibrium (NLTE) effects. Here we present Sunspot’s umbra data taken with the 1.5 m GREGOR telescope are analyzed after the effects of the stray-light on the data are removed using a novel deconvolution technique. The full Stokes measurements of a sunspot near disk center in the near-infrared spectral range were obtained with the GRIS instrument installed at the GREGOR telescope. A point-spread-function (PSF) including the effects of the telescope, the Earth’s atmospheric seeing, and the scattered light is constructed using prior Mercury observations with GRIS and the information provided by the adaptative optics system of the GREGOR telescope during the observations. The data are deconvolved from the PSF using a Principal Component Deconvolution method. The data are then analyzed using the NICOLE inversion code which can take into account the NLTE effects in the Si i 1082.9 nm line. The information of the magnetic field in taken into account within the inversion. Results. We found that the Si i 1082.9 nm line appears in emission in sunspot umbra after the effects of the scattered light (stray-light coming from wide angles) is removed. We show how the spectral line shape changes dramatically with the amount of scattered light. Current umbral empirical models are not able to reproduce the detected emission, taking into account NLTE effects. This is, to our knowledge, the first time the Si i 1082.9 nm line is seen in emission in sunspot umbrae.
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Morten Franz

Session: Science

535 views
Date of upload:
11.11.2016
Co-author:
The GREGOR Team
Abstract:
In this contribution, we investigate to which degree strayligh influences results from the GREGOR Infrared Spectrograph. To this end, we use the synthesis module of the SIR code to perform radiative transfer calculations in a 3D-MHD model atmosphere of a full sunspot. We convolve the resulting Stokes spectra spatially and spectrally with theoretical point spread functions (PSF) as well as a PSF obtained during the Mercury transit and compare the results to GRIS observations.
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Meetu Verma

Session: Science

571 views
Date of upload:
11.11.2016
Co-author:
Abstract:
n/a
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Oskar von der Lühe

Session: Current Status and Infromation

432 views
Date of upload:
14.11.2016
Co-author:
Thomas Berkefeld, Detlev Sprung, Karin Stein, Erik Sucher
Abstract:
We have measured the refractive index structure coefficient Cn2 at the VTT and GREGOR site for the past four years. We were using a laser scintillometer to measure free atmosphere Cn2 between the VTT and GREGOR towers, and anemometers on the GREGOR platform to measure localized seeing in the vicinity of the telescope. We present first results from these measurements and their comparison with seeing proxys derived from the GREGOR adaptive optics system GAOS.
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Oskar von der Lühe

Session: Current Status and Infromation

653 views
Date of upload:
14.11.2016
Co-author:
Sebastian Hoch, Lars Bielak
Abstract:
We present the current status of the GREGOR Broadband Imager (BBI) and show first results from two observing campaigns in July/august and September 2016.
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Dirk Soltau

Session: Current Status and Infromation

502 views
Date of upload:
14.11.2016
Co-author:
Abstract:
This presentation describes estimations of the GREGOR optical performance, based on measured surfaces and estimated surface properties
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Christoph Kuckein

Session: Science

540 views
Date of upload:
15.11.2016
Co-author:
Abstract:
Short overview of the four SOLARNET campaigns in 2016 at GREGOR
There are no uploaded posters yet.
There are no uploaded papers yet.
First Name Last Name Affiliation