Conveners
Poster Session 4.1
- Etienne Pariat (LESIA, Observatoire de Paris)
This paper presents the results of the analysis of the dynamics of coronal holes on the Sun during the period May 13, 2010- May 13, 2021. In our study used images in the extreme ultraviolet in the Fe XII, XXIV line (193 Å) obtained with the Atmospheric Imager Assembly of the Solar Dynamics Observatory (AIA/SDO). To localize coronal holes and determine their areas, we used the Heliophysics...
The polar precursor method is widely considered to be the most robust physically motivated method to predict the strengths of an upcoming solar cycle. It uses in form of indicators, the magnetic field concentrated near the poles around sunspot minimum. Here, we present an extensive performance analysis of various such predictors, based on observational data like (WSO magnetograms, MWO polar...
We performed a digitization of maximum magnetic field measurements in sunspots. The original data were acquired as drawings at the Crimean Astrophysical Observatory of the Russian Academy of Sciences (CrAO RAS). About 1000 sunspots observed in 2014 were analyzed. The data were compared to the corresponding measurements from the SDO/HMI instrument. For the same sunspot, the maximum modulus of...
One of the methods to predict the future solar activity is the minimum - maximum method, which is based on a linear relationship between relative sunspot number in the minimum and maximum epochs of solar cycles. It belongs to the precursor class of the solar activity forecasting methods. In present work we apply a modified version of this method using data not only from the minimum year, but...
The 11-Year solar cycle is driven by the sun’s magnetic field. The sunspot number is the most-common long term index of solar activity and prediction of its amplitude can help to understand the effects of space weather & solar activity. Previous studies have shown that analyzing the solar activity of the two hemispheres separately instead of the full sun can provide more detailed information...
The quasi-biennial oscillation (QBO) is a low amplitude oscillatory signal commonly seen in solar activity proxies and may hold the key to a greater understanding of the solar dynamo. This will help us mitigate the risks that come with space weather which is driven by the solar magnetic field. In addition, mid-cycle oscillations have been observed on other stars, making the impact of this work...
To find out observational evidences for the turbulent component of the solar dynamo in the convective zone is a very challenging problem because the dynamo action is hidden below the photosphere. Here we present results of a statistical study of active regions (ARs) with strong flares (>X1.0) occurred during the 23rd and 24th solar cycles. A suggested magneto-morphological classification of...
