University of Oulu

Pevtsov, A. A., Petrie, G., MacNeice, P., & Virtanen, I. I. (2020). Effect of additional magnetograph observations from different Lagrangian points in Sun‐Earth system on predicted properties of quasi‐steady solar wind at 1 AU. Space Weather, 18, e2020SW002448.

Effect of additional magnetograph observations from different lagrangian points in Sun‐Earth system on predicted properties of quasi‐steady solar wind at 1 AU

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Author: Pevtsov, A. A.1; Petrie, G.1; MacNeice, P.2;
Organizations: 1National Solar Observatory, Boulder, CO, USA
2NASA Goddard Space Flight Center, Greenbelt, MD, USA
3The Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 8.3 MB)
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Language: English
Published: American Geophysical Union, 2020
Publish Date: 2020-09-25


Modeling the space weather conditions for a near‐Earth environment depends on a proper representation of magnetic fields on the Sun. There are discussions in the community with respect to the value of observations taken at several Lagrangian points (L₁–L₅) in the Sun‐Earth system. Observations from a single (e.g., Earth/L₁) vantage point are insufficient to characterize rapid changes in magnetic field on the far side of the Sun. Nor can they represent well the magnetic fields near the solar poles. However, if the changes in sunspot activity were moderate, how well would our predictions of the solar wind based on a single viewing point work? How much improvement could we see by adding magnetograph observations from L₅, L₄, and even L₃? Here, we present the results of our recent modeling, which shows the level of improvement in forecasting the properties of the solar wind at Earth made possible by using additional observations from different vantage points during a period of moderate evolution of sunspot activity. As an example, we also show the improvements to the solar wind forecast from adding a single observation of the southern polar area from out‐of‐ecliptic spacecraft at −30° heliographic latitude vantage point.

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Series: Space weather
ISSN: 1542-7390
ISSN-E: 1542-7390
ISSN-L: 1542-7390
Volume: 18
Issue: 7
Article number: e2020SW002448
DOI: 10.1029/2020SW002448
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: We acknowledge the financial support by the Academy of Finland to the ReSoLVE Centre of Excellence (Project 307411). A. A. P. was partially supported by a NASA Grant 80NSSC18K1242.
Academy of Finland Grant Number: 307411
Detailed Information: 307411 (Academy of Finland Funding decision)
Copyright information: © 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.