21 citations · 88 across the 19 of their papers we have counts for
19 papers
Large-Scale Latitude-time Relationships Between the Green-Line Corona and Sunspot Activity During Solar Cycles 18-24
Jouni J. Takalo
We investigate the latitude-time relationship between the solar green-line corona and sunspot activity during Solar Cycles 18-24 using homogeneous coronal observations and a Gaussi…
Oscillatory Interference in Dirichlet L-Functions and the Separation of Primes
Jouni J. Takalo
Dirichlet's theorem guarantees infinitely many primes in each reduced residue class modulo q, but the analytic mechanism underlying this separation is often difficult to visualize…
Prime-Weighted Interference Patterns Inspired by the Euler Product
Jouni J. Takalo
We study a prime-weighted oscillatory model inspired by structural aspects of the Euler product of the Riemann zeta function. The model defines finite superpositions of prime-frequ…
The latitudinal migration of the sunspot groups
Jouni J. Takalo
We analyse the monthly sunspot group (SG) data for Solar Cycles C8-C23 and calculate the average latitude of the drift path for the northern and southern hemisphere of the Sun. We…
The Instantaneous Response of Geomagnetic Field, near-Earth IMF and Cosmic-Ray Intensity to Solar Flares
Jouni J. Takalo
We show using superposed epoch analysis (SEA) that the most energetic protons (greater than 60 MeV) in near-Earth IMF have a peak almost immediately (less than a day) after peak in…
Analysis of the Solar Flare Index for Solar Cycles 18-24: Extremely Deep Gnevyshev Gap in the Chromosphere
Jouni J. Takalo
We study the solar flare index (SFI) for the solar cycles 18\,--\,24. We find that SFI has deeper Gnevyshev gap (GG) in its first principal component than other atmospheric paramet…
Spatial and Temporal Distribution of Solar Green Line Corona for Solar Cycles 18-24
Jouni J. Takalo
Homogeneous coronal data set (HCDS) of the green corona (Fe XIV) and coronal index of the solar activity (CI) have been used to study time-latitudinal distribution in solar cycles…
Extracting Hale Cycle Related Components from Cosmic-Ray Data Using Principal Component Analysis
Jouni J. Takalo
We decompose the monthly cosmic-ray data, using several neutron monitor count rates, of Cycles 19-24 with principal component analysis (PCA). We show using different cycle limits t…
Persistence of temperature and precipitation: from local to global anomalies
Jouni J. Takalo
Using detrended fluctuation analysis (DFA) we find that all continents are persistent in temperature. The scaling exponents of the southern hemisphere (SH) continents, i.e., South…
Separating aa-index into Solar and Hale Cycle Related Components Using Principal Component Analysis
Jouni Takalo
We decompose the monthly aa-index of cycles 10-23 using principal component analysis (PCA). We show that the first component (PC1) is related to solar cycle, and accounts for 41.5…
Comparison of geomagnetic indices during even and odd solar cycles SC17-SC24: Signatures of Gnevyshev gap in geomagnetic activity
Jouni J. Takalo
We show that the time series of sunspot-group areas has a gap, the so-called Gnevyshev gap (GG), between ascending and descending phases of the cycle and especially so for the even…
Temporal Distribution of Solar Cycle 24 Sunspot Groups: Comparison to Cycles 12-23
Jouni J. Takalo
We analyze the temporal distribution of sunspot groups for even and odd cycles in the range SC12-SC24. It seems that cycle 24 is a characteristic even cycle, although with low ampl…
Trends of continental, zonal and seasonal land temperatures in the 20th century
Jouni Takalo, Kalevi Mursula
We study the evolution of continental, zonal and seasonal land temperature anomalies especially in the early 20th century warming (ETCW) period, using principal component analysis…
On the self-replicating properties of Riemann zeta zeros: A statistical study
Jouni J. Takalo
We study distributions of differences of unscaled Riemann zeta zeros, , at large distances. We show, that independently of the height, a subset of finite number of success…
Comparison of the shape and temporal evolution of even and odd solar cycles
Jouni Takalo, Kalevi Mursula
Results. The PCA confirms the existence of the Gnevyshev gap (GG) for solar cycles at about 40% from the start of the cycle. The temporal evolution of sunspot area data for even cy…
Comparison of Latitude Distribution and Evolution of Even and Odd Sunspot Cycles
Jouni J. Takalo
We study the latitudinal distribution and evolution of sunspot areas from Solar Cycle 12 to Solar Cycle 23 (SC12-SC23) and sunspot-groups of from Solar Cycle 8 to Solar Cycle 23 (S…
On the statistics of differences of zeta zeros starting from zero number
Jouni Takalo
We study distributions of differences of unscaled Riemann zeta zeros, , at large. We show, that independently of the location of the zeros, i.e., even for zeros as high as…
Distributions of differences of Riemann zeta zeros
Jouni Juhani Takalo
We study distributions of differences of unscaled Riemann zeta zeros, , at large. We show, that independently of the location of the zeros, their differences have similar sta…
Principal component analysis of sunspot cycle shape
Jouni Takalo, Kalevi Mursula
We study the shape of sunspot cycles using the Wolf sunspot numbers and group sunspot numbers of solar cycles 1-23. We determine the most typical "model" cycles and the most asymme…