Automated Detection of Accelerating Solar Eruptions Using Parabolic Hough Transform

Patel, Ritesh; Pant, Vaibhav; Iyer, Priyanka; Banerjee, D.; Mierla, M.; West, Matthew J.

doi:10.1007/s11207-021-01770-z

Cited by 14 publications

(13 citation statements)

References 48 publications

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“…Inspired by the WL automated-detection algorithms of CACTus and SEEDS, Patel et al (2021) used the large FOV of SWAP, along with EUVI and AIA observations to build and test an automated-tracking algorithm, CME Identification in Inner Solar Corona (CIISCO), that uses Fourier motion filtering and the parabolic Hough transform for the first time to automatically detect off-disk solar eruptions in the lower and middle corona. The Hough transform is suited to tracking the kinematic profiles of eruptions in their initiation and impulsive phases.…”

Section: Automatically Detecting Eruptionsmentioning

confidence: 99%

A Review of the Extended EUV Corona Observed by the Sun Watcher with Active Pixels and Image Processing (SWAP) Instrument

et al. 2022

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The Sun Watcher with Active Pixels and Image Processing (SWAP) instrument onboard ESA’s PRoject for On Board Autonomy 2 (PROBA2) has provided the first uncompressed, high-cadence, continuous, large field-of-view observations of the extended extreme-ultraviolet (EUV) corona for over a complete solar cycle. It has helped shape our understanding of this previously understudied region, and pioneered research into the middle corona. In this article, we present a review of all publications that have utilized these observations to explore the extended EUV corona, highlighting the unique contributions made by SWAP. The review is broadly divided into three main sections of SWAP-based studies about: i) long-lived phenomena, such as streamers, pseudo-streamers, and coronal fans; ii) dynamic phenomena, such as eruptions, jets, EUV waves, and shocks; iii) coronal EUV emission generation. We also highlight SWAP’s imaging capabilities, techniques that have been applied to observations to enhance the off-limb observations and its legacy.

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Section: Automatically Detecting Eruptionsmentioning

confidence: 99%

A Review of the Extended EUV Corona Observed by the Sun Watcher with Active Pixels and Image Processing (SWAP) Instrument

et al. 2022

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“…The main impulsive acceleration phase however, is qualitatively very different from the initial slow rise phase and involves a rapid increase in acceleration in a short interval of time, that shoots the CMEs to high velocities (e.g. Bein et al 2011;Cheng et al 2020;Patel et al 2021). Earlier studies have suggested that this main acceleration phase occurs at the lower coronal heights and hence might not be always captured using traditional white-light coronagraphic observations (Gallagher et al 2003;Temmer et al 2008;Majumdar et al 2021a).…”

Section: Introductionmentioning

confidence: 99%

On the Variation of Volumetric Evolution of CMEs from Inner to Outer Corona

Majumdar,

Patel,

Pant

2022

Preprint

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Some of the major challenges faced in understanding the early evolution of Coronal Mass Ejections (CMEs) are due to limited observations in the inner corona (< 3 R ) and the plane of sky measurements. In this work, we have thus extended the application of the Graduated Cylindrical Shell (GCS) model to the inner coronal observations from the ground-based coronagraph K-Cor of the Mauna Loa Solar Observatory (MLSO) along with the pair of observations from COR-1 onboard the Solar Terrestrial Relations Observatory (STEREO). We study the rapid initial acceleration and width expansion phase of 5 CMEs in white-light in the lower heights. We also study the evolution of the modelled volume of these CMEs in inner corona and report for the first time, a power law dependence of the CME volume with distance from the Sun. We further find the volume of ellipsoidal leading front and the conical legs follow different power laws, thus indicating differential volume expansion through a CME. The study also reveals two distinct power laws for the total volume evolution of CMEs in the inner and outer corona, thus suggesting different expansion mechanisms at these different heights. These results besides aiding our current understanding on CME evolution, will also provide better constraints to CME initiation and propagation models. Also, since the loss of STEREO-B (and hence COR-1B data) from 2016, this modified GCS model presented here will still enable stereoscopy in the inner corona for the 3D study of CMEs in white-light.

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“…EUV coronal structures were also enhanced while reducing the dominance of noise based on a fuzzy algorithm (Druckmüller, 2013) and using Gaussian filtering for bringing out features at different scales (Morgan and Druckmüller, 2014). In another algorithm, CMEs Identification in Inner Solar Corona (CIISCO), a radial filter was applied on EUV images by dividing each individual image by a background uniform in azimuth direction generated using the radial intensity profile of the polar regions of the Sun (Patel et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A Simple Radial Gradient Filter for Batch-Processing of Coronagraph Images

Patel,

Majumdar,

Pant

et al. 2022

Preprint

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Images of the extended solar corona, as observed by white-light coronagraphs as observed by different white-light coronagraphs include the K-and F-corona and suffer from a radial variation in intensity. These images require separation of the two coronal components with some additional image-processing to reduce the intensity gradient and analyse the structures and processes occurring at different heights in the solar corona within the full field of view. Over the past few decades, coronagraphs have been producing enormous amounts of data, which will be continued with the launch of new telescopes. To process these bulk coronagraph images with steep radial-intensity gradients, we have developed an algorithm: Simple Radial Gradient Filter (SiRGraF). This algorithm is based on subtracting a minimum background (F-corona) created using long duration images and then dividing the resultant by a uniform intensity gradient image to enhance the K-corona. We demonstrate the utility of this algorithm to bring out the short time-scale transient structures of the corona. SiRGraF could be used to reveal and analyse such structures. It is not suitable for quantitative estimations based on intensity. We have successfully tested the algorithm on images of the Large Angle Spectroscopic COronagraph (LASCO)-C2 onboard the Solar and Heliospheric Observatory (SOHO), and COR-2A onboard the Solar TErrestrial D. Banerjee

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Automated Detection of Accelerating Solar Eruptions Using Parabolic Hough Transform

Cited by 14 publications

References 48 publications

A Review of the Extended EUV Corona Observed by the Sun Watcher with Active Pixels and Image Processing (SWAP) Instrument

A Review of the Extended EUV Corona Observed by the Sun Watcher with Active Pixels and Image Processing (SWAP) Instrument

On the Variation of Volumetric Evolution of CMEs from Inner to Outer Corona

A Simple Radial Gradient Filter for Batch-Processing of Coronagraph Images

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