PoS - Proceedings of Science
Volume 425 - The Multifaceted Universe: Theory and Observations - 2022 (MUTO2022) - Astronomical instruments and methods
On the role of empirical boundary conditions in space weather prediction results
M.L. Demidov
Full text: pdf
Pre-published on: September 27, 2022
Published on:
Prediction of conditions in the near-Earth space environment (space weather) is an urgent scientific
and practical task, and there are several scientific teams in the world which have been deeply
involved in this research using various model assumptions. One of the most important problems
in such calculations is the reliability of the initial data - synoptic maps of the solar magnetic fields.
The most famous Space Weather Prediction Center (SWPC) uses observations of the Global
Oscillations Network Group (GONG). However, there are other sources of measurements of the
full-disk solar magnetic fields (WSO, SDO/HMI and SOLIS in the USA, IRmag at Mitaka in Japan,
SMAT in China, STOPs in Russia), and it is of interest to use them to calculate the parameters
of solar wind. In this paper this is done on the example of Carrington Rotation (CR) 2164
using observations from Wilcox Solar Observatory (WSO), GONG, Solar Telescope for Operative
Prediction (STOP) at the Sayan Solar Observatory (SSO). The calculations are based on the
Wang-Sheeley-Arge (WSA) model and include the determination of the parameters of the coronal
magnetic field in the Potential Field Source Surface (PFSS) approximation. The propagation of
the solar wind to the Earth's orbit is calculated using the HUX (Heliospheric Upwind eXtrapolation)
model. It is shown that the differences in solar wind speeds for different data sets can reach 200
km/s or even more. The results of model simulations are compared with the experimental ACE
satellite data
DOI: https://doi.org/10.22323/1.425.0004
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