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Category/Subcategory: Natural Sciences/Astronomy

How-To MLT_4

Author: Monika Ellwarth
Short How-To about how to call the MLT_ 4 recognition code.

Views: 92

Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow

Author: Markus Roth
Accurate measurements of deep solar meridional flow are of vital interest for understanding the solar dynamo. In this paper, we validate a recently developed method for obtaining sensitivity functions (kernels) for travel-time mea ... more

Views: 168

Sensitivity Kernels for Flows in Time-Distance Helioseismology: Extension to Spherical Geometry

Author: Vincent Böning
We extend an existing Born approximation method for calculating the linear sensitivity of helioseismic travel times to flows from Cartesian to spherical geometry. This development is necessary for using the Born approximation for ... more

Views: 636

Modelling solar and stellar brightness variabilities

Author: Alexander Shapiro
Total and spectral solar irradiance, TSI and SSI, have been measured from space since 1978. This is accompanied by the development of models aimed at replicating the observed variability by relating it to solar surface magnetism. ... more

Views: 426

GRAVITY near infrared multiple beams analysing system: software and characterization results

Author: Narsireddy Anugu
We report the status and the characterization results of the GRAVITY acquisition camera.

Views: 518

The Carina Nebula and Gum 31 molecular complex: I. Molecular gas distribution, column densities and dust temperatures

Author: Michael Burton
We report high resolution observations of the 12CO(1 → 0) and 13CO(1 → 0) molecular lines in the Carina Nebula and the Gum 31 region obtained with the 22-m Mopra telescope as part of the The Mopra Southern Galactic Plane CO Su ... more

Views: 466

Spicules and their on-disk counterparts - the main driver for solar chromospheric heating?

Author: Klaus Gerhard Puschmann
The question how the outer solar atmosphere is heated from solar photospheric temperatures of about 5800K up to solar chromospheric and coronal temperatures of about 20.000K and millions of degrees respectively, remained without a ... more

Views: 1013

Observational evidence for variations of the acoustic cutoff frequency with height in the solar atmosphere

Author: Aneta Wisniewska
Direct evidence for the existence of an acoustic cuto frequency in the solar atmosphere is given by observations performed by using the HELioseismological Large Regions Interferometric DEvice operating on the Vacuum Tower Teles ... more

Views: 414

Measurement of the VLT pupil motions using a 2 × 2 lenslet evaluated aberrations

Author: Narsireddy Anugu
We present the telescope pupil tracking strategy for the GRAVITY interferometer.

Views: 437