Impacts of small coronal transients at Parker Solar Probe at times of density increases and burst of magnetic switchbacks - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Impacts of small coronal transients at Parker Solar Probe at times of density increases and burst of magnetic switchbacks

A. Vourlidas
  • Fonction : Auteur
N. E. Raouafi
  • Fonction : Auteur
G. Stenborg
  • Fonction : Auteur
J. C. Kasper
  • Fonction : Auteur
S. Bale
R. A. Howard
  • Fonction : Auteur
N. M. Viall
  • Fonction : Auteur
M. L. Stevens
  • Fonction : Auteur
K. E. Korreck
  • Fonction : Auteur
A. W. Case
  • Fonction : Auteur
P. L. Whittlesey
  • Fonction : Auteur
D. E. Larson
  • Fonction : Auteur
J. S. Halekas
  • Fonction : Auteur
R. Livi
K. Goetz
P. Harvey
R. J. Macdowall
  • Fonction : Auteur
D. Malaspina
M. Pulupa
J. W. Bonnell
  • Fonction : Auteur

Résumé

A subset at least of the slow solar wind is released in the form of transients ejected continually along streamer rays. The physical mechanisms responsible for these transient releases of dense material are not yet fully understood. We exploit a period when the NASA Solar-TErrestrial RElations Observatory-A (STEREO-A) was in orbital quadrature with Parker Solar Probe (PSP) to track the release and propagation of dense material from the corona to PSP. At the time PSP had passed its second perihelion and was located near the Thomson sphere of the inner Heliospheric Imager (HI-1) onboard STEREO-A. This provided optimal observing conditions to track dense and therefore bright structures from the corona to the Sun-approaching spacecraft. We show that the streamers were continually ejecting bursts of dense structures (so-called 'blobs') many of which exhibiting V-shapes that are reminiscent of either magnetic kinks and/or the well-known back ends of small magnetic flux ropes. The wide-angle imager on Parker Solar Probe imaged similar structures at other locations of the streamers during this second encounter suggesting a global nature of this transient activity. We find evidence in STEREO ultraviolet images for slow reconfigurations of the corona near the estimated source regions of these structures but no one-to-one association is yet clearly established between the lower and upper corona. The exploitation of height-time maps ('J-maps') built from COR-2 and HI-1 images of the solar wind allow us to track the dense features all the way to PSP. We show that the spacecraft was repeatedly impacted by the southern edge of these structures. The passage of the bright coronal material at PSP is associated with clear density increases measured by the plasma instrument as expected. We also find evidence that the impact of the specific dense structures are correlated with a higher occurrence of magnetic field reversals. Part of this work was funded by the European Research Council through the project SLOW_SOURCE - DLV-819189
Fichier non déposé

Dates et versions

hal-03563812 , version 1 (10-02-2022)

Identifiants

Citer

A. P. Rouillard, A. Kouloumvakos, A. Vourlidas, N. E. Raouafi, B. Lavraud, et al.. Impacts of small coronal transients at Parker Solar Probe at times of density increases and burst of magnetic switchbacks. American Geophysical Union, 2019, San Francisco, United States. ⟨hal-03563812⟩
17 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More