83 citations · 167 across the 11 of their papers we have counts for
11 papers
Comparative analysis of Debrecen sunspot catalogues
L. Győri, A. Ludmány, T. Baranyi
Sunspot area data are important for studying solar activity and its long term variations. At the Debrecen Heliophysical Observatory, we compiled three sunspot catalogues: the Debre…
Heritage of Konkoly's Solar Observations: the Debrecen Photoheliograph Programme and the Debrecen Sunspot Databases
T. Baranyi, L. Győri, A. Ludmány
The primary task of the Debrecen Heliophysical Observatory (DHO) was to produce the detailed and reliable photographic documentation of the solar photospheric activity since 1958.…
Active Longitude and Solar Flare Occurrences
N. Gyenge, A. Ludmány, T. Baranyi
The aim of the present work is to specify the spatio-temporal characteristics of flare activity observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and Ge…
Search for Possible Connections of Sunspot Features and Torsional Waves
J. Muraközy, A. Ludmány
The torsional oscillation is a well established observational fact and there are theoretical attempts for its description but no final solution has yet been accepted. One of the po…
Development and morphology of leading-following parts of sunspot groups
J. Muraközy, T. Baranyi, A. Ludmány
The detailed sunspot catalogues, the DPD and SDD allow to study the leading and following parts of sunspot groups separately. We examine the equilibrium distance of the two parts,…
Temporal Variations of Coriolis-turns in the Photosphere
J. Muraközy, A. Ludmány
Correlations have been studied between longitudinal and latitudinal shifts of sunspot groups in the period 1986-1998. This study is based on the Debrecen Photoheliographic Data (DP…
Considerations on the Spörer-diagram - torsional wave relationship
J. Muraközy, A. Ludmány
Studies on the earlier reported spatial correlations between magnetic field distributions and the torsional wave have been substantially extended to the period 1975-2009. The inves…
North-south differences of solar cycles
J. Muraközy, A. Ludmány
A long-term variation is detected in the north-south differences of the solar activity, the phase difference of hemispheric cycles alternates by four Schwabe cycles. This variabili…
Variations of Solar Non-axisymmetric Activity
N. Gyenge, T. Baranyi, A. Ludmány
The temporal behaviour of solar active longitudes has been examined by using two sunspot catalogues, the Greenwich Photoheliographic Results (GPR) and the Debrecen Photoheliographi…
Phase lags of solar hemispheric cycles
J. Muraközy, A. Ludmány
The North-South asymmetry of solar activity is variable in time and strength. We analyse the long-term variation of the phase lags of hemispheric cycles and check a conjectured rel…
Cycle dependence of the longitudinal-latitudinal sunspot motion correlations
J. Muraközy, A. Ludmány
aims: It is well known that the azimuthal and meridional shifts of sunspots are correlated and that the correlation exhibits a latitudinal distribution, which is expected due to th…