Solar Mass Ejection Imager (SMEI) observations of coronal mass ejections (CMEs) in the heliosphere

Webb, D. F.; Mizuno, D. R.; Buffington, A.; Cooke, M. P.; Eyles, C. J.; Fry, C. D.; Gentile, L. C.; Hick, P. P.; Holladay, P. E.; Howard, T. A.; Hewitt, J. G.; Jackson, B. V.; Johnston, J. C.; Kuchar, T. A.; Mozer, J. B.; Price, S. D.; Radick, R. R.; Simnett, G. M.; Tappin, S. J.

doi:10.1029/2006ja011655

Cited by 74 publications

(69 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[3] A list of 139 ICMEs detected by SMEI through July 2004 and a discussion of their properties were given by Webb et al [2006]. The primary morphology descriptors assigned to the ICMEs were: arc, blob, and loop.…”

Section: Introductionmentioning

confidence: 99%

“…[4] Webb et al [2006] discussed the V arc ICMEs in terms of disconnected magnetic fields surrounding CMEs. In this view [Webb and Cliver, 1995], CME loops lying predominately in the plane of the sky undergo magnetic reconnection behind the CME cavity to produce the concave-outward Varcs seen in many coronagraph observations.…”

Section: Introductionmentioning

confidence: 99%

“…[8] The characteristics of the 139 ICMEs observed during the first 1.5 years of SMEI operation have been reviewed by Webb et al [2006]. The four V arc ICMEs of that study and the more recent one found in observations through September 2005 are listed in Table 1.…”

mentioning

confidence: 99%

“…The four V arc ICMEs of that study and the more recent one found in observations through September 2005 are listed in Table 1. For each ICME we give the date of observation, the position angle (PA) and compass Table 2 of Webb et al [2006] serve as the basis for a comparison of the five V arc ICMEs with the full population. The V arc ICMEs are typical in durations (12 -50 hours versus mean 16 hours), W (20°-50°versus average 42°), and angular speeds (0.6-1.54°/hour versus mean 1.1°/hour).…”

mentioning

confidence: 99%

See 3 more Smart Citations

V arc interplanetary coronal mass ejections observed with the Solar Mass Ejection Imager

2007

Self Cite

View full text Add to dashboard Cite

[1] Since February 2003, the Solar Mass Ejection Imager (SMEI) has been observing interplanetary coronal mass ejections (ICMEs) at solar elongation angles > 20°. The ICMEs generally appear as loops or arcs in the sky, but five show distinct outward concave shapes that we call V arcs. We expect to observe some V arcs, formed by trailing edges of ICME flux ropes or by leading ICME edges sheared by solar wind (SW) speed gradients at the heliospheric current sheet. We characterize the properties of these V arcs and compare them with average properties of all SMEI ICMEs. The typical V arc speeds argue against a slow MHD shock interpretation for their structures. We estimate the V arc solar source locations and their opening angle dynamics as tests for SW shearing. The first test contradicts but the second supports the SW shearing explanation. The implications of the small number of V arcs observed with SMEI is considered. The point P approximation used to determine the V arc locations and inferred solar source regions is critically examined in Appendix A.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

V arc interplanetary coronal mass ejections observed with the Solar Mass Ejection Imager

2007

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Solar Mass Ejection Imager (SMEI), a sophisticated white-light imager (Eyles et al 2003;Jackson et al 2004) is currently operating on the US Coriolis satellite launched in January 2003 (Webb et al 2006). Coriolis is a Sun synchronous satellite in a dawn-dusk circular polar orbit along the Earth's terminator at an altitude of 840 km and an inclination of 98°relative to the equatorial plane.…”

Section: Coronal Mass Ejections (Cmes)mentioning

confidence: 99%

Space Weather: Physics, Effects and Predictability

2010

View full text Add to dashboard Cite

The time varying conditions in the near-Earth space environment that may affect space-borne or ground-based technological systems and may endanger human health or life are referred to as space weather. Space weather effects arise from the dynamic and highly variable conditions in the geospace environment starting from explosive events on the Sun (solar flares), Coronal Mass Ejections near the Sun in the interplanetary medium, and various energetic effects in the magnetosphere-ionosphere-atmosphere system. As the utilization of space has become part of our everyday lives, and as our lives have become increasingly dependent on technological systems vulnerable to the space weather influences, the understanding and prediction of hazards posed by these active solar events have grown in importance. In this paper, we review the processes of the Sun-Earth interactions, the dynamic conditions within the magnetosphere, and the predictability of space weather effects on radio waves, satellites and ground-based technological systems today.

show abstract

The Solar Stormwatch CME catalogue: Results from the first space weather citizen science project

et al. 2014

View full text Add to dashboard Cite

Solar Stormwatch was the first space weather citizen science project, the aim of which is to identify and track coronal mass ejections (CMEs) observed by the Heliospheric Imagers aboard the STEREO satellites. The project has now been running for approximately 4 years, with input from >16,000 citizen scientists, resulting in a data set of >38,000time‐elongation profiles of CME trajectories, observed over 18 preselected position angles. We present our method for reducing this data set into a CME catalogue. The resulting catalogue consists of 144 CMEs over the period January 2007 to February 2010, of which 110 were observed by STEREO‐A and 77 were observed by STEREO‐B. For each CME, the time‐elongation profiles generated by the citizen scientists are averaged into a consensus profile along each position angle that the event was tracked. We consider this catalogue to be unique, being at present the only citizen science‐generated CME catalogue, tracking CMEs over an elongation range of 4° out to a maximum of approximately 70°. Using single spacecraft fitting techniques, we estimate the speed, direction, solar source region, and latitudinal width of each CME. This shows that at present, the Solar Stormwatch catalogue (which covers only solar minimum years) contains almost exclusively slow CMEs, with a mean speed of approximately 350 km s−1. The full catalogue is available for public access at http://www.met.reading.ac.uk/~spate/solarstormwatch. This includes, for each event, the unprocessed time‐elongation profiles generated by Solar Stormwatch, the consensus time‐elongation profiles, and a set of summary plots, as well as the estimated CME properties.

show abstract

Solar Mass Ejection Imager (SMEI) observations of coronal mass ejections (CMEs) in the heliosphere

Cited by 74 publications

References 46 publications

V arc interplanetary coronal mass ejections observed with the Solar Mass Ejection Imager

V arc interplanetary coronal mass ejections observed with the Solar Mass Ejection Imager

Space Weather: Physics, Effects and Predictability

The Solar Stormwatch CME catalogue: Results from the first space weather citizen science project

Contact Info

Product

Resources

About