Napredna pretraga

Pregled bibliografske jedinice broj: 368713

Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag


Vršnak, Bojan; Vrbanec, Dijana; Čalogović, Jaša
Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag // Astronomy and Astrophysics, 490 (2008), 2; 811-815 doi:10.1051/0004-6361:200810215 (međunarodna recenzija, članak, znanstveni)


Naslov
Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag

Autori
Vršnak, Bojan ; Vrbanec, Dijana ; Čalogović, Jaša

Izvornik
Astronomy and Astrophysics (0935-4956) 490 (2008), 2; 811-815

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sun: coronal mass ejections (CMEs); Sun: corona; Sun: solar wind; magnetohydrodynamics (MHD)

Sažetak
Context. Coronal and interplanetary propagation of coronal mass ejections (CMEs) is strongly affected by aerodynamic drag. Aims. The dependence of the drag acceleration on the mass of the CMEs is investigated to establish a quantitative empirical relationship, which might be important in semi-empirical space-weather forecasting. Methods. We employ a large sample of CMEs observed in the radial distance range of 2?30 solar radii by the Large Angle and Spectrometric Coronagraph on board the SoHO mission to statistically analyze the acceleration-velocity relationship in subsamples of various classes of CME masses. Results. It is demonstrated that the slope and the v-axis intercept of the anti-correlation of the CME acceleration a and velocity v depend on the mean mass of CMEs included in the sample. The slope k of the correlation is less steep for subsamples of higher masses, revealing that massive CMEs are less affected by the aerodynamic drag. Furthermore, it is found that the v-axis intercept is shifted to higher velocities for subsamples of higher masses. This indicates that, on average, the driving force is greater in more massive CMEs. Conclusions. The empirically established dependence of the a(v) slope on the CME mass is very close to the dependence which follows from the physical characteristics of the aerodynamic drag.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
007-0000000-1362 - Eruptivni procesi u Sunčevoj atmosferi (Bojan Vršnak, )

Ustanove
Geodetski fakultet, Zagreb

Profili:

Avatar Url Jaša Čalogović (autor)

Avatar Url Bojan Vršnak (autor)

Citiraj ovu publikaciju

Vršnak, Bojan; Vrbanec, Dijana; Čalogović, Jaša
Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag // Astronomy and Astrophysics, 490 (2008), 2; 811-815 doi:10.1051/0004-6361:200810215 (međunarodna recenzija, članak, znanstveni)
Vršnak, B., Vrbanec, D. & Čalogović, J. (2008) Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag. Astronomy and Astrophysics, 490 (2), 811-815 doi:10.1051/0004-6361:200810215.
@article{article, year = {2008}, pages = {811-815}, DOI = {10.1051/0004-6361:200810215}, keywords = {Sun: coronal mass ejections (CMEs), Sun: corona, Sun: solar wind, magnetohydrodynamics (MHD)}, journal = {Astronomy and Astrophysics}, doi = {10.1051/0004-6361:200810215}, volume = {490}, number = {2}, issn = {0935-4956}, title = {Dynamics of coronal mass ejections - The mass-scaling of the aerodynamic drag}, keyword = {Sun: coronal mass ejections (CMEs), Sun: corona, Sun: solar wind, magnetohydrodynamics (MHD)} }

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
  • Scopus


Uključenost u ostale bibliografske baze podataka:


  • NASA ADS


Citati