Bibcode
Luna, M.; Toot, David; Lopez-Ariste, Arturo; Schmieder, Brigitte; Knizhnik, Kalman; Kucera, Therese
Referencia bibliográfica
Nature of Prominences and their role in Space Weather, Proceedings of the International Astronomical Union, IAU Symposium, Volume 300, pp. 435-436
Advertised on:
1
2014
Número de citas
0
Número de citas referidas
0
Descripción
We have observed a quiescent prominence with the Hinode Solar Optical
Telescope (SOT) (Ca II and Hα lines), Sacramento Peak Dunn Solar
Telescope using the Universal Birefringent Filter (DST/UBF, in Hα,
Hβ and Sodium-D lines), THEMIS (Télescope
Héliographique pour l Etude du Magnétisme et des
Instabilités Solaires/MTR (Multi Raies) spectromagnetograph (He
D3), and the Solar Dynamics Observatory Atmospheric Imaging
Assembly (SDO/AIA) in EUV over a 4 hour period on 2012 October 10. The
small fields of view of the SOT, DST, and MTR are centered on a large
prominence footpoint extending towards the surface. This feature appears
in the larger field of view of the AIA/304 Å filtergram as a
large, quasi-vertical pillar with loops on each side. The THEMIS/MTR
data indicate that the magnetic field in the pillar is essentially
horizontal and the observations in the optical domain show a large
number of horizontally aligned features in the pillar. The data are
consistent with a model of cool prominence plasma trapped in the dips of
horizontal field lines. The SOT and DST data show what appear to be
moving wave pulses. These pulses, which include a Doppler signature,
move vertically, perpendicular to the field direction, along
quasi-vertical columns of horizontal threads in the pillar. The pulses
have a velocity of propagation of about 10 km/s, a wavelength about 2000
km in the plane of the sky, and a period about 280 sec. We interpret
these waves in terms of fast magnetosonic waves.