54 citations · 195 across the 12 of their papers we have counts for
12 papers
Participation, selection and indicative bidding in auctions with costly entry
Changxia Ke, Greg Kubitz, Yang Liu
We study auctions with costly entry in which bidders have incomplete information about their affiliated private valuations prior to entry. We examine whether indicative bidding--a…
An analysis of the solar differential rotation in solar cycle No. 19 (1954-1964) determined using Kanzelhoehe sunspot group positions
Ivana Poljancic Beljan, Luka Sibenik, Tomislav Jurkic +7
We study solar differential rotation (DR) for solar cycle No. 19 (1954-1964) by tracing sunspot groups on the sunspot drawings of Kanzelhoehe Observatory for Solar and Environmenta…
Maximal growth rate of the ascending phase of a sunspot cycle for predicting its amplitude
Tatiana Podladchikova, Shantanu Jain, Astrid M. Veronig +4
Forecasting the solar cycle amplitude is important for a better understanding of the solar dynamo as well as for many space weather applications. We demonstrated a steady relations…
Variation in solar differential rotation and activity in the period 1964-2016 determined by the Kanzelhöhe data set
I. Poljančić Beljan, R. Jurdana-Šepić, T. Jurkić +8
We determined the differential rotation (DR) parameters and (corresponding to the equatorial rotation velocity and the gradient of the solar DR) by tracing sunspot groups i…
Kanzelhöhe Observatory: instruments, data processing and data products
Werner Pötzi, Astrid Veronig, Robert Jarolim +5
Kanzelhöhe Observatory for Solar and Environmental Research (KSO) of the University of Graz (Austria) is in continuous operation since its foundation in 1943. Since the beginning i…
Meridional Motions and Reynolds Stress Determined by Using Kanzelhöhe Drawings and White Light Solar Images from 1964 to 2016
Domagoj Ruždjak, Davor Sudar, Roman Brajša +6
Sunspot position data obtained from Kanzelhöhe Observatory for Solar and Environmental Research (KSO) sunspot drawings and white light images in the period 1964 to 2016 were used t…
Statistical Properties of Ribbon Evolution and Reconnection Electric Fields in Eruptive and Confined Flares
Jürgen Hinterreiter, Astrid M. Veronig, Julia K. Thalmann +2
A statistical study of the chromospheric ribbon evolution in H two-ribbon flares is performed. The data set consists of 50 confined () and eruptive () flares tha…
Reconnection fluxes in eruptive and confined flares and implications for superflares on the Sun
Johannes Tschernitz, Astrid M. Veronig, Julia K. Thalmann +2
We study the energy release process of a set of 51 flares (32 confined, 19 eruptive) ranging from GOES class B3 to X17. We use H filtergrams from Kanzelhöhe Observatory together…
Ground-based Observations of the Solar Sources of Space Weather (Invited Review)
Astrid M. Veronig, Werner Pötzi
Monitoring of the Sun and its activity is a task of growing importance in the frame of space weather research and awareness. Major space weather disturbances at Earth have their or…
70 years of Sunspot Observations at Kanzelhöhe Observatory: systematic study of parameters affecting the derivation of the relative sunspot number
Werner Pötzi, Astrid M. Veronig, Manuela Temmer +3
Kanzelhöhe Observatory (KSO) was founded during World War II by the "Deutsche Luftwaffe" (German Airforces) as one station of a network of observatories, which should provide infor…
Filament and Flare Detection in Hα image sequences
Gernot Riegler, Thomas Pock, Werner Pötzi +1
Solar storms can have a major impact on the infrastructure of the earth. Some of the causing events are observable from ground in the Hα spectral line. In this paper we propose a n…
Multiwavelength imaging and spectroscopy of chromospheric evaporation in an M-class solar flare
A. M. Veronig, J. Rybak, P. Gömöry +6
We study spectroscopic observations of chromospheric evaporation mass flows in comparison to the energy input by electron beams derived from hard X-ray data for the white-light M2.…