Prosiectau fesul blwyddyn
Crynodeb
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.
Iaith wreiddiol | Saesneg |
---|---|
Rhif yr erthygl | 103 |
Tudalennau (o-i) | 1-14 |
Nifer y tudalennau | 14 |
Cyfnodolyn | Astrophysical Journal |
Cyfrol | 840 |
Rhif cyhoeddi | 2 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 12 Mai 2017 |
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'Identification of Low Coronal Sources of "Stealth" Coronal Mass Ejections Using New Image Processing Techniques'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Proffiliau
Prosiectau
- 1 Wedi Gorffen
-
A High Resolution imaging spectrometer for visible coronal emission lines
Morgan, H. (Prif Ymchwilydd) & Gunn, M. (Cyd-ymchwilydd)
Science & Technology Facilities Council
01 Medi 2016 → 01 Maw 2021
Prosiect: Ymchwil a ariannwyd yn allanol