Projects per year
Abstract
Coronal mass ejections (CMEs) are generally associated with low coronal
signatures (LCSs), such as flares, filament eruptions, extreme
ultraviolet (EUV) waves, or jets. A number of recent studies have
reported the existence of stealth CMEs as events without LCSs, possibly
due to observational limitations. Our study focuses on a set of 40
stealth CMEs identified from a study by D’Huys et al. New image
processing techniques are applied to high-cadence, multi-instrument sets
of images spanning the onset and propagation time of each of these CMEs
to search for possible LCSs. Twenty-three of these events are identified
as small, low-mass, unstructured blobs or puffs, often occurring in the
aftermath of a large CME, but associated with LCSs such as small flares,
jets, or filament eruptions. Of the larger CMEs, seven are associated
with jets and eight with filament eruptions. Several of these filament
eruptions are different from the standard model of an erupting
filament/flux tube in that they are eruptions of large, faint flux tubes
that seem to exist at large heights for a long time prior to their slow
eruption. For two of these events, we see an eruption in Large Angle
Spectrometric Coronagraph C2 images and the consequent changes at the
bottom edge of the eruption in EUV images. All 40 events in our study
are associated with some form of LCS. We conclude that stealth CMEs
arise from observational and processing limitations.
Original language | English |
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Article number | 103 |
Pages (from-to) | 1-14 |
Number of pages | 14 |
Journal | Astrophysical Journal |
Volume | 840 |
Issue number | 2 |
DOIs | |
Publication status | Published - 12 May 2017 |
Keywords
- Sun: activity
- Sun: corona
- Sun: coronal mass ejections: CMEs
- Sun: filaments
- prominences
- Sun: flares
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Projects
- 1 Finished
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A High Resolution imaging spectrometer for visible coronal emission lines
Science and Technology Facilities Council
01 Sept 2016 → 01 Mar 2021
Project: Externally funded research