STEREO observed stealth CME
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== Introduction == | == Introduction == | ||
[[Image:Where_is_STEREO-1Jun2008.png|300px|thumb|right|'''Figure 1''': Schematic view of the CME that erupted on June 1st 2008, projected on the ecliptic plane (top view). The separation angle between the A and B spacecraft was <math>53^{\circ}</math>. The CME traveled towards STEREO B and was clearly visible in coronagraph images from STEREO A.]] | [[Image:Where_is_STEREO-1Jun2008.png|300px|thumb|right|'''Figure 1''': Schematic view of the CME that erupted on June 1st 2008, projected on the ecliptic plane (top view). The separation angle between the A and B spacecraft was <math>53^{\circ}</math>. The CME traveled towards STEREO B and was clearly visible in coronagraph images from STEREO A.]] | ||
- | The twin [http://stereo.gsfc.nasa.gov/ STEREO] probes are two identical spacecraft, one flying ahead (A) of the Earth and one flying behind it (B). They were launched on Wednesday, October 25th, 2006 from Cape Canaveral, Florida. The separation angle between the two spacecraft increases as time progresses. This double observation allows us to view solar activity from two different vantage points. On June 1st 2008, the angle between STEREO A and STEREO B reached <math>53^{\circ}</math> (Fig 1). On this day, a [http://en.wikipedia.org/wiki/Coronal_mass_ejection coronal mass ejection] (CME) was observed by the STEREO A coronagraphs ( | + | The twin [http://stereo.gsfc.nasa.gov/ STEREO] probes are two identical spacecraft, one flying ahead (A) of the Earth and one flying behind it (B). They were launched on Wednesday, October 25th, 2006 from Cape Canaveral, Florida. The separation angle between the two spacecraft increases as time progresses. This double observation allows us to view solar activity from two different vantage points. On June 1st 2008, the angle between STEREO A and STEREO B reached <math>53^{\circ}</math> (Fig 1). On this day, a [http://en.wikipedia.org/wiki/Coronal_mass_ejection coronal mass ejection] (CME) was observed by the STEREO A coronagraphs (Fig 2), while no trace of it was seen in the STEREO B images! This was very surprising, since STEREO B had full view on the eruption. This observation confirms earlier suspicions that CMEs exist that have no clear surface signatures. |
== "Stealth" CMEs == | == "Stealth" CMEs == | ||
- | [http://en.wikipedia.org/wiki/Stealth_technology | + | In comparison to [http://en.wikipedia.org/wiki/Stealth_technology stealth technology], |
== Problem storm == | == Problem storm == |
Revision as of 20:39, 26 May 2009
Introduction
The twin STEREO probes are two identical spacecraft, one flying ahead (A) of the Earth and one flying behind it (B). They were launched on Wednesday, October 25th, 2006 from Cape Canaveral, Florida. The separation angle between the two spacecraft increases as time progresses. This double observation allows us to view solar activity from two different vantage points. On June 1st 2008, the angle between STEREO A and STEREO B reached (Fig 1). On this day, a coronal mass ejection (CME) was observed by the STEREO A coronagraphs (Fig 2), while no trace of it was seen in the STEREO B images! This was very surprising, since STEREO B had full view on the eruption. This observation confirms earlier suspicions that CMEs exist that have no clear surface signatures.
"Stealth" CMEs
In comparison to stealth technology,