W. Pötzi
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View article: Characteristics of the Solar Differential Rotation and Activity During Solar Cycle No. 24
Characteristics of the Solar Differential Rotation and Activity During Solar Cycle No. 24 Open
An analysis of the solar differential rotation (DR) during solar cycle No. 24 (SC24) (2009–2019), based on the Kanzelhöhe Observatory for Solar and Environmental Research (KSO) data set, is presented. The white-light images were processed …
View article: Global landscape of space weather observations, research and operations
Global landscape of space weather observations, research and operations Open
The recognition of space weather hazards is increasingly growing, highlighting the importance of monitoring and forecasting it. High precision satellite positioning techniques have become essential in various areas of social and economic i…
View article: A deep learning framework for instrument-to-instrument translation of solar observation data
A deep learning framework for instrument-to-instrument translation of solar observation data Open
The constant improvement of astronomical instrumentation provides the foundation for scientific discoveries. In general, these improvements have only implications forward in time, while previous observations do not benefit from this trend,…
View article: Hybrid AI Approaches for Solar Feature Recognition Using Ground-Based Instrument Data
Hybrid AI Approaches for Solar Feature Recognition Using Ground-Based Instrument Data Open
The dynamic behavior of solar prominences and filaments is a preursor to coronal mass ejections (CMEs), which can disrupt Earth's magnetosphere and affect satellite communications. Systematic ground-based solar observations, conducted with…
View article: Parameter Study of Geoeffective Active Regions
Parameter Study of Geoeffective Active Regions Open
Geomagnetic storms (GSs) are major disturbances in the terrestrial atmosphere caused by the reconnection process between the incoming plasma ejecta in the solar wind and the planetary magnetosphere. The strongest GSs can lead to auroral di…
View article: A universal method for solar filament detection from H<i>α</i>observations using semi-supervised deep learning
A universal method for solar filament detection from H<i>α</i>observations using semi-supervised deep learning Open
Filaments are omnipresent features in the solar atmosphere. Their location, properties, and time evolution can provide important information about changes in solar activity and assist in the operational space weather forecast. Therefore, f…
View article: Instrument-To-Instrument translation: Instrumental advances drive restoration of solar observation series via deep learning
Instrument-To-Instrument translation: Instrumental advances drive restoration of solar observation series via deep learning Open
The constant improvement of astronomical instrumentation provides the foundation for scientific discoveries. In general, these improvements have only implications forward in time, while previous observations do not benefit from this trend.…
View article: Large Sunspot Groups and Great Magnetic Storms: Magnetic Suppression of CMEs
Large Sunspot Groups and Great Magnetic Storms: Magnetic Suppression of CMEs Open
A solar spot group with a large area is not a requirement for a great magnetic storm. Nearly half (14/30) of all storms with a minimum Dst value ≤−300 nT from 1932–2014 originated in spot groups with corrected areas ≤1000 millionths of a s…
View article: Maximal growth rate of the ascending phase of a sunspot cycle for predicting its amplitude
Maximal growth rate of the ascending phase of a sunspot cycle for predicting its amplitude Open
Context. Forecasting the solar cycle amplitude is important for a better understanding of the solar dynamo as well as for many space weather applications. Different empirical relations of solar cycle parameters with the peak amplitude of t…
View article: Variation in solar differential rotation and activity in the period 1964–2016 determined by the Kanzelhöhe data set
Variation in solar differential rotation and activity in the period 1964–2016 determined by the Kanzelhöhe data set Open
Aims. Theoretical calculations predict an increased equatorial rotation and more pronounced differential rotation (DR) during the minimum of solar magnetic activity. However, the results of observational studies vary, some showing less and…
View article: Predicting the solar cycle amplitude with the new catalogue of hemispheric sunspot numbers
Predicting the solar cycle amplitude with the new catalogue of hemispheric sunspot numbers Open
<p>The sun&#8217;s magnetic field drives the 11-year solar cycle, and predicting its strength has practical importance for many space weather applications. Previous studies have shown that analysing the solar activity of the two …
View article: Instrument-To-Instrument translation: Instrumental advances drive restoration of solar observation series via deep learning
Instrument-To-Instrument translation: Instrumental advances drive restoration of solar observation series via deep learning Open
The constant improvement of astronomical instrumentation provides the foundation for scientific discoveries. In general, these improvements have only implications forward in time, while previous observations do not benefit from this trend.…
View article: Kanzelhöhe Observatory: instruments, data processing and data products
Kanzelhöhe Observatory: instruments, data processing and data products Open
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 its main task was the regular observation of the Sun in full…
View article: Kanzelhöhe Observatory: Instruments, Data Processing and Data Products
Kanzelhöhe Observatory: Instruments, Data Processing and Data Products Open
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, its main task was the regular observation of the Sun in ful…
View article: The Solar Activity Monitor Network – SAMNet
The Solar Activity Monitor Network – SAMNet Open
The Solar Activity Magnetic Monitor (SAMM) Network (SAMNet) is a future UK-led international network of ground-based solar telescope stations. SAMNet, at its full capacity, will continuously monitor the Sun’s intensity, magnetic, and Doppl…
View article: Migration of Solar Polar Crown Filaments in the Past 100 Years
Migration of Solar Polar Crown Filaments in the Past 100 Years Open
Polar crown filaments (PCFs) are formed above the polarity inversion line, which separates unipolar polar fields and the nearest dispersed fields. They are important features in studying solar polar fields and their cyclical variations. Du…
View article: An Event-Based Verification Scheme for the Real-Time Flare Detection System at Kanzelhöhe Observatory
An Event-Based Verification Scheme for the Real-Time Flare Detection System at Kanzelhöhe Observatory Open
In the framework of the Space Situational Awareness program of the European Space Agency (ESA/SSA), an automatic flare detection system was developed at Kanzelhöhe Observatory (KSO). The system has been in operation since mid-2013. The eve…
View article: Horizontal flow below solar filaments
Horizontal flow below solar filaments Open
Context. Observations of the internal fine structures of solar filaments indicate that the threads of filaments follow magnetic field lines. The magnetic field inside the filament has a strong axial component. Some models of magnetic field…
View article: Solar differential rotation in the period 1964–2016 determined by the Kanzelhöhe data set
Solar differential rotation in the period 1964–2016 determined by the Kanzelhöhe data set Open
Context. Kanzelhöhe Observatory for Solar and Environmental Research (KSO) provides daily multispectral synoptic observations of the Sun using several telescopes. In this work we made use of sunspot drawings and full disk white light CCD i…
View article: A comparison of long-term parallel measurements of sunshine duration obtained with a Campbell-Stokes sunshine recorder and two automated sunshine sensors
A comparison of long-term parallel measurements of sunshine duration obtained with a Campbell-Stokes sunshine recorder and two automated sunshine sensors Open
In recent decades, automated sensors for sunshine duration (SD) measurements have been introduced in meteorological networks, thereby replacing traditional instruments, most prominently the Campbell-Stokes (CS) sunshine recorder. Parallel …
View article: An automated method for the evaluation of the pointing accuracy of Sun-tracking devices
An automated method for the evaluation of the pointing accuracy of Sun-tracking devices Open
The accuracy of solar radiation measurements, for direct (DIR) and diffuse (DIF) radiation, depends significantly on the precision of the operational Sun-tracking device. Thus, rigid targets for instrument performance and operation have be…
View article: An automated method for the evaluation of the pointing accuracy ofsun-tracking devices
An automated method for the evaluation of the pointing accuracy ofsun-tracking devices Open
The accuracy of solar radiation measurements (for direct and diffuse radiation) depends significantly on the precision of the operational sun-tracking device. Thus rigid targets for instrument performance and operation have been specified …
View article: Ground-based Observations of the Solar Sources of Space Weather (Invited Review)
Ground-based Observations of the Solar Sources of Space Weather (Invited Review) Open
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 origin in energetic outbursts from the Sun: solar flares, cor…