Статья

Evidence for Alfven Waves in Solar X-ray Jets

Jonathan CirtainHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAL. GolubHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAL. L. LundquistHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAA. A. van BallegooijenHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAAntonia SavchevaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAM. ShimojoHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAE. E. DeLucaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAS. TsunetaHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USATaro SakaoHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAKatharine K. ReevesHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAMark WeberHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USARyouhei KanoHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USANoriyuki NarukageHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USAK. ShibasakiHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

2007en

ABI

Аннотация

Coronal magnetic fields are dynamic, and field lines may misalign, reassemble, and release energy by means of magnetic reconnection. Giant releases may generate solar flares and coronal mass ejections and, on a smaller scale, produce x-ray jets. Hinode observations of polar coronal holes reveal that x-ray jets have two distinct velocities: one near the Alfvén speed ( approximately 800 kilometers per second) and another near the sound speed (200 kilometers per second). Many more jets were seen than have been reported previously; we detected an average of 10 events per hour up to these speeds, whereas previous observations documented only a handful per day with lower average speeds of 200 kilometers per second. The x-ray jets are about 2 x 10(3) to 2 x 10(4) kilometers wide and 1 x 10(5) kilometers long and last from 100 to 2500 seconds. The large number of events, coupled with the high velocities of the apparent outflows, indicates that the jets may contribute to the high-speed solar wind.

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Идентификаторы

DOI: 10.1126/science.1147050

Цитирования и источники

Цитирований: 2Использованных источников: 0

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