AUTOMATED LASCO CME CATALOG FOR SOLAR CYCLE 23: ARE CMEs SCALE INVARIANT?
By E. Robbrecht, D. Berghmans, R. A. M. Linden. 2008
225 citations recorded by the source corpus.
In this paper, we present the first automatically constructed LASCO coronal mass ejection (CME) catalog, a result of the application of the Computer Aided CME Tracking software (CACTus) on the LASCO archive during the interval 1997 September–2007 January. We have studied the CME characteristics and have compared them with similar results obtained by manual detection (CDAW CME catalog). On average, CACTus detects less than two events per day during solar minimum, up to eight events during maximum, nearly half of them being narrow (<20°). Assuming a correction factor, we find that the CACTus CME rate is surprisingly consistent with CME rates found during the past 30 years. The CACTus statistics show that small-scale outflow is ubiquitously observed in the outer corona. The majority of CACTus-only events are narrow transients related to previous CME activity or to intensity variations in the slow solar wind, reflecting its turbulent nature. A significant fraction (about 15%) of CACTus-only events were identified as independent events, thus not related to other CME activity. The CACTus CME width distribution is essentially scale invariant in angular span over a range of scales from 20° to 120° while previous catalogs present a broad maximum around 30°. The possibility that the size of coronal mass outflows follow a power-law distribution could indicate that no typical CME size exists, i.e., that the narrow transients are not different from the larger well defined CMEs.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/d8b875b4edafa0f97af0a354b2d160398bd4646d
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
Citations in the corpus
- SunPy—Python for solar physics (2015, methodology): “listing 12: Example of querying the HEC service to multiple CME catalogues, in this case the ones detected automatically by the by the Computer Aided CME Tracking feature recognition algorithm (CACTus - http://sidc.oma.be/cactus/; Robbrecht et al., 2009).”
- Solar wind drivers of geomagnetic storms during more than four solar cycles (2012, background): “The three flow types are: (1) Corotating high-speed streams (typically with solar wind speed Vsw > ~450 km s 1) (Belcher & Davis 1971) that originate in coronal holes at the Sun (Krieger et al. 1973; Zirker 1977), and the associated corotating interaction regions; (2) Slower, interstream solar wind,”
- Near-earth solar wind flows and related geomagnetic activity during more than four solar cycles (1963-2011) (2012, background): “The results indicate that the percentage of the time when the CME-associated flows are present tends to follow the solar activity/sunspot cycle, as would be expected given that the CME rate at the Sun follows the activity cycle (Webb & Howard 1994; Yashiro et al. 2004; Robbrecht et al. 2009).”
- The Solar Probe Plus Mission: Humanity’s First Visit to Our Star (2016, background): “Solar eruptive events, which are known to contribute to the bursty solar wind, form a continuous spectrum in size (Robbrecht et al. 2009), and the fractionation that gives rise to measurable compositional signatures is likely size dependent.”
- EUHFORIA: European heliospheric forecasting information asset (2018, methodology): “At any given time, at least several CMEs are present in the inner heliosphere on average, as even during solar minimum several CMEs are launched per day (Robbrecht et al., 2009).”
- Coronal Mass Ejections: Observations (2012, methodology): “Many CMEs have also been observed to be unassociated with any obvious solar surface activity (Howard and Tappin, 2008; Robbrecht et al., 2009a).”