| | ESA Science & Technology: Cluster captures a double cusp (Site not responding. Last check: 2007-09-23) |
 | | However, as Cluster continues its northward journey towards the pole and enters the cusp, the proton population is characterised by lower energy, typically 0 to 5000 eV. |
 | | However, Rumba stayed inside the cusp for some one and a half hours, considerably longer than Tango - an indication that the region was highly mobile and rapidly shifting location. |
 | | Further observations of this double cusp phenomenon should help to clarify what is happening in the turbulent, unpredictable ocean of particles in near-Earth space. |
| sci.esa.int /science-e/www/object/index.cfm?fobjectid=28549 (725 words) |