Results 11 to 20 of about 1,248,900 (279)

CYCLES AND UNIVERSALITY IN SUNSPOT NUMBER FLUCTUATIONS

The Astrophysical Journal, 2009
We analyze the famous Wolf's sunspot numbers. Surprisingly, we discovered that the distribution of the sunspot number fluctuations for both the ascending and descending phases is close to the universal nonparametric Bramwell-Holdsworth-Pinton (BHP) distribution. Since the BHP probability density function appears in several other physical phenomena, our
R. Gonçalves, A. A. Pinto, N. Stollenwerk   +2 more
openaire   +3 more sources

Forecasting long-term sunspot numbers using the LSTM-WGAN model [PDF]

Frontiers in Astronomy and Space Sciences
The sunspot number, an indicator of solar activity, is vital for forecasting variations in solar activity and predicting disturbances of the geomagnetic field.
Hao Yang, Hao Yang, Pingbing Zuo, Pingbing Zuo, Kun Zhang, Kun Zhang, Zhenning Shen, Zhengyang Zou, Xueshang Feng, Xueshang Feng   +9 more
doaj   +2 more sources

Responses and Periodic Variations of Cosmic Ray Intensity and Solar Wind Speed to Sunspot Numbers

Advances in Astronomy, 2020
To investigate the periodic behaviour and relationship of sunspot numbers with cosmic ray intensity and solar wind speed, we present analysis from daily data generated from 1995 January to 2018 December. Cross-correlation and wavelet transform tools were
Jacob Oloketuyi, Yu Liu, Amobichukwu Chukwudi Amanambu, Mingyu Zhao   +3 more
doaj   +2 more sources

Can Sunspot Activity Affect the Population Dynamics of Cotton Bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)? [PDF]

Insects
Whether there is a correlation between sunspots and an impact on insects has long been a subject of debate. As a worldwide pest, the cotton bollworm can feed on a variety of plants and cause great harm to agriculture.
Jian Huang, Xiaojun Wang
doaj   +2 more sources

A Deep Learning Approach for Automated Total Sunspot Number Estimation [PDF]

The Astrophysical Journal
Accurate sunspot number estimation is essential for understanding the long-term evolution of solar activity and its impact on space weather. Sunspot numbers have been manually determined, leading to inconsistencies and observer-dependent biases.
Yimin Wang, Jiajia Liu, Jing Chen, Robertus Erdélyi, Norbert G. Gyenge, Ye Jiang   +5 more
doaj   +2 more sources

Wavelet and cross correlation analysis on some climatology parameters of Nepal

Bibechana, 2021
This study has been performed to understand the relationship between sunspot numbers (SSN) with climatology related parameters like temperature and rainfall from 1901 to 2016.
Babu Ram Tiwari, Jiyao Xu, Binod Adhikari, Narayan Prasad Chapagain   +3 more
doaj   +3 more sources

The Ratio Between the Number of Sunspot and the Number of Sunspot Groups [PDF]

Geomagnetism and Aeronomy, 2017
Data from three solar observatories, Learmonth, Holloman, and San Vito, are used to study the variations in the average number of sunspots per sunspot group. It is found that the different types of sunspot groups and the number of sunspots in these groups have different solar cycle and cycle to cycle variations.
Georgieva, K., Kilcik, A., Nagovitsyn, Yu., Kirov, B.   +3 more
openaire   +2 more sources

Relationship between group sunspot numbers and Wolf sunspot numbers [PDF]

Astronomische Nachrichten, 2010
AbstractContinuous wavelet transform and cross‐wavelet transform have been used to investigate the phase periodicity and synchrony of the monthly mean Wolf (Rz) and group (Rg) sunspot numbers during the period of June 1795 to December 1995. The Schwabe cycle is the only one common period in Rg and Rz, but it is not well‐defined in case of cycles 5–7 of
Li, Kejun, Liang, Hongfei
openaire   +2 more sources

Hemispheric sunspot numbers 1874–2020 [PDF]

Astronomy & Astrophysics, 2021
Context. Previous studies show significant north–south asymmetries for various features and indicators of solar activity. These findings suggest some decoupling between the two hemispheres over the solar cycle evolution, which is in agreement with dynamo theories.
Astrid M. Veronig, Shantanu Jain, Tatiana Podladchikova, Werner Pötzi, Frederic Clette   +4 more
openaire   +2 more sources

Fractal Dimension and Maximum Sunspot Number in Solar Cycle [PDF]

Journal of Astronomy and Space Sciences, 2006
The fractal dimension is a quantitative parameter describing the characteristics of irregular time series. In this study, we use this parameter to analyze the irregular aspects of solar activity and to predict the maximum sunspot number in the following ...
R.-S. Kim, Y. Yi, K.-S. Cho, Y.-J. Moon, S. W. Kim   +4 more
doaj   +1 more source