Pregled bibliografske jedinice broj: 1004343
The Dependence of the Peak Velocity of High- Speed Solar Wind Streams as Measured in the Ecliptic by ACE and the STEREO satellites on the Area and Co-latitude of Their Solar Source Coronal Holes
The Dependence of the Peak Velocity of High- Speed Solar Wind Streams as Measured in the Ecliptic by ACE and the STEREO satellites on the Area and Co-latitude of Their Solar Source Coronal Holes // JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 123 (2018), 1738-1753 doi:10.1002/2017JA024586 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 1004343 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
The Dependence of the Peak Velocity of High- Speed Solar Wind Streams as Measured in the Ecliptic by ACE and the STEREO satellites on the Area and Co-latitude of Their Solar Source Coronal Holes
Autori
Hofmeister, Stefan J. ; Veronig, Astrid ; Temmer, Manuela ; Vennerstrom, Susanne ; Heber, Bernd ; Vršnak, Bojan
Izvornik
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2169-9380) 123
(2018);
1738-1753
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
coronal hole ; solar wind high-speed stream ; propagation ; latitude ; area ; geomagnetic storm ; Astrophysics - Solar and Stellar Astrophysics
Sažetak
We study the properties of 115 coronal holes in the time range from August 2010 to March 2017, the peak velocities of the corresponding high- speed streams as measured in the ecliptic at 1 AU, and the corresponding changes of the Kp index as marker of their geoeffectiveness. We find that the peak velocities of high-speed streams depend strongly on both the areas and the co-latitudes of their solar source coronal holes with regard to the heliospheric latitude of the satellites. Therefore, the co-latitude of their source coronal hole is an important parameter for the prediction of the high-speed stream properties near the Earth. We derive the largest solar wind peak velocities normalized to the coronal hole areas for coronal holes located near the solar equator and that they linearly decrease with increasing latitudes of the coronal holes. For coronal holes located at latitudes ≳60°, they turn statistically to zero, indicating that the associated high-speed streams have a high chance to miss the Earth. Similarly, the Kp index per coronal hole area is highest for the coronal holes located near the solar equator and strongly decreases with increasing latitudes of the coronal holes. We interpret these results as an effect of the three-dimensional propagation of high-speed streams in the heliosphere ; that is, high-speed streams arising from coronal holes near the solar equator propagate in direction toward and directly hit the Earth, whereas solar wind streams arising from coronal holes at higher solar latitudes only graze or even miss the Earth.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
HRZZ-IP-2013-11-6212 - Promjenjivost Sunca i zvijezda (SOLSTEL) (Vršnak, Bojan, HRZZ - 2013-11) ( CroRIS)
Ustanove:
Geodetski fakultet, Zagreb
Profili:
Bojan Vršnak
(autor)
Poveznice na cjeloviti tekst rada:
doi arxiv.org agupubs.onlinelibrary.wiley.com agupubs.onlinelibrary.wiley.comCitiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
Uključenost u ostale bibliografske baze podataka::
- nasa ads
