Origins of Rolling, Twisting, and Non-radial Propagation of Eruptive Solar Events

Panasenco, O.; Martin, Sara; Velli, M.; Vourlidas, A.

doi:10.1007/s11207-012-0194-3

Cited by 89 publications

(78 citation statements)

References 41 publications

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“…Some CMEs were found to be deflected toward the weak magnetic field region associated with the streamer belt or the heliospheric current sheet (e.g., Xie et al 2009;Kay et al 2013;Liewer et al 2015), while Xie et al (2009) reported that fast CMEs could be deflected away from the streamer belt. The coronal hole with strong open magnetic field is one important factor that can divert a CME (e.g., Gopalswamy et al 2004Gopalswamy et al , 2005Gopalswamy et al , 2009Xie et al 2009;Panasenco et al 2013). Möstl et al (2015) and Wang et al (2015) found that the strong magnetic field of a sunspot in an active region (AR) and the configurations of the magnetic field surrounding the source region play a significant role in channeling the CME.…”

Section: Introductionmentioning

confidence: 99%

Multi-spacecraft Observations of the Coronal and Interplanetary Evolution of a Solar Eruption Associated with Two Active Regions

Liu

Wang

et al. 2017

ApJ

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We investigate the coronal and interplanetary evolution of a coronal mass ejection (CME) launched on 2010 September 4 from a source region linking two active regions (ARs) 11101 and 11103, using extreme ultraviolet imaging, magnetogram, white-light and in situ observations from SDO, STEREO, SOHO, VEX and Wind. A potential-field source-surface model is employed to examine the configuration of the coronal magnetic field surrounding the source region. The graduated cylindrical shell model and a triangulation method are applied to determine the kinematics of the CME in the corona and interplanetary space. From the remote sensing and in situ observations we obtain some key results: (1) the CME was deflected in both the eastward and southward directions in the low corona by the magnetic pressure from the two ARs and possibly interacted with another ejection, which caused that the CME arrived at VEX that was longitudinally distant from the source region; (2) although VEX was closer to the Sun, the observed and derived CME arrival times at VEX are not earlier than those at Wind, which suggests the importance of determining both the frontal shape and propagation direction of the CME in interplanetary space; (3) the ICME was compressed in the radial direction while the longitudinal transverse size was extended.

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Section: Introductionmentioning

confidence: 99%

Multi-spacecraft Observations of the Coronal and Interplanetary Evolution of a Solar Eruption Associated with Two Active Regions

Liu

Wang

et al. 2017

ApJ

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“…Also we found evidence for additional cases in the EIT 304-Å data from the EIT experiment on board the SOHO satellite Panasenco et al, 2011). By 2008, we felt the evidence was then sufficiently solid to propose a study to NASA in which we would search for the cause of this rolling in some erupting prominences.…”

Section: The Buildup To Cmes and Insights On The Roll Effectmentioning

confidence: 73%

“…The idea one gets from one view or preconceived model can cause one to misinterpret what one sees in another case. The Grand Daddy prominence, often mistaken as large-scale magnetic flux tube or flux rope, is a prime example; the observer's description has been largely overlooked (Pettit, 1946).…”

Section: Preconceptions Misconceptions and Illusionsmentioning

confidence: 99%

Questioning Many Mysteries

Martin

2015

Sol Phys

Self Cite

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The first section of this memoir queries my formative years. Indirectly I address the question, did my childhood and early years make a difference in my choice of career? Why and how did I begin my journey to becoming a scientist? Did I choose the field of solar astronomy or did circumstances dictate it for me? In the second section, I travel through my work environments and experiences, talking about interactions and aspects of being a scientist that do not appear in our research papers. What parts of my research were happenstances and what parts did I plan? What does it feel like to be on scientific quests? Using examples in my journey, I also turn to questions that have intrigued me throughout my sojourn as a solar astronomer. How do scientific discoveries come about? What factors lead to little discoveries? And what factors lead to major exciting discoveries? Are there timely questions we do not think to ask? How can small, seemingly scattered pieces of knowledge suddenly coalesce into a deeper understanding -what is called the "Aha!" experience -the times when our mental light switches on, and with child-like wonder we behold a "big picture"?

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“…Close to the Sun, effects of the ambient magnetic field become evident as observational signatures of CME rotation during which most probably an adjustment to the ambient magnetic field structure is taking place (see e.g., Panasenco et al 2013;Vourlidas et al 2011;Yurchyshyn et al 2009Yurchyshyn et al , 2001). Influences of magnetic field pressure gradients are also observed as longitudinal/latitudinal deflection, i.e.…”

Section: Effects Of the Ambient Environment On Cme Propagationmentioning

confidence: 99%

Kinematical properties of coronal mass ejections

Temmer

2016

Astron Nachr

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Coronal mass ejections (CMEs) are the most dynamic phenomena in our solar system. They abruptly disrupt the continuous outflow of solar wind by expelling huge clouds of magnetized plasma into interplanetary space with velocities enabling to cross the Sun-Earth distance within a few days. Earth-directed CMEs may cause severe geomagnetic storms when their embedded magnetic fields and the shocks ahead compress and reconnect with the Earth's magnetic field. The transit times and impacts in detail depend on the initial CME velocity, size, and mass, as well as on the conditions and coupling processes with the ambient solar wind flow in interplanetary space. The observed CME parameters may be severly affected by projection effects and the constant changing environmental conditions are hard to derive. This makes it difficult to fully understand the physics behind CME evolution, preventing to do a reliable forecast of Earth-directed events. This short review focusing on observational data, shows recent methods which were developed to derive the CME kinematical profile for the entire Sun-Earth distance range as well as studies which were performed to shed light on the physical processes that CMEs encounter when propagating from Sun to Earth.Comment: accepted for publication in Astronomische Nachrichte

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Origins of Rolling, Twisting, and Non-radial Propagation of Eruptive Solar Events

Cited by 89 publications

References 41 publications

Multi-spacecraft Observations of the Coronal and Interplanetary Evolution of a Solar Eruption Associated with Two Active Regions

Multi-spacecraft Observations of the Coronal and Interplanetary Evolution of a Solar Eruption Associated with Two Active Regions

Questioning Many Mysteries

Kinematical properties of coronal mass ejections

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