On the Relationship between Magnetic Expansion Factor and Observed Speed of the Solar Wind from Coronal Pseudostreamers

• Published in: The Astrophysical journal Vol. 898; no. 1; pp. 78 - 90
• Main Authors: Wallace, Samantha, Arge, C. Nick, Viall, Nicholeen, Pihlström, Ylva
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.07.2020; IOP Publishing
• Subjects: Acceleration; Astrophysics; Empirical analysis; Photosphere; Solar corona; Solar coronal streamers; Solar wind; Solar wind velocity; Spacecraft; Statistical analysis; Steady state; Tubes; Wind speed

For the past 30+ yr, the magnetic expansion factor (fs) has been used in empirical relationships to predict solar wind speed (vobs) at 1 au based on an inverse relationship between these two quantities. Coronal unipolar streamers (i.e., pseudostreamers) undergo limited field line expansion, resultin...