Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...501l.217d&link_type=abstract
Astrophysical Journal Letters v.501, p.L217
Astronomy and Astrophysics
Astronomy
197
Sun: Corona, Sun: Solar Wind, Sun: Uv Radiation
Scientific paper
On 1996 March 7, the Solar and Heliospheric Observatory spacecraft conducted a multi-instrument campaign to observe polar plumes in the south polar coronal hole. Recent time-domain analyses of EUV Imaging Telescope images from that campaign show filamentary substructure in the plumes, on a length scale of ~5", which changes on timescales of a few minutes, and coherent quasi-periodic perturbations in the brightness of Fe IX and Fe X line emission at 171 A from the plumes. The perturbations amount to 10%-20% of the plumes' overall intensity and propagate outward at 75-150 km s-1, taking the form of wave trains with periods of 10-15 minutes and envelopes of several cycles. We conclude that the perturbations are compressive waves (such as sound waves or slow-mode magnetosonic waves) propagating along the plumes. Assuming that the waves are sonic yields a mechanical energy flux of 150-400 W m-2 (1.5- 4 x105 ergs cm-2 s-1) in the plumes.
DeForest Craig Edward
Gurman Joe B.
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