Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.11h&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
The class of spicule-like processes comprises a variety of phenomena that were given different names, depending on how and where on the Sun they can be observed - including (classical limb) spicules, macrospicules, FUV spicules, mottles, fibrils, and the "type II spicules" recently discovered with Hinode. The relationships between these phenomena are not fully clarified. We point out that the reported observed properties cannot all be reconciled with a single driving mechanism. Indeed, many different mechanisms have been suggested in the past, all with some success. We argue that this was ultimately possible because the observed properties are consistent with an approximate equipartition between enthalpy, kinetic energy, and presumably also magnetic energy. One of the most popular driving mechanisms of the last few years invokes the guiding of global p-mode oscillations along magnetic field lines that are sufficiently inclined against the vertical, so that the cutoff frequency for longitudinal waves drops below the excitation frequency. We show that in such a situation transverse, and perhaps also torsional, waves are much more promising, because of their weaker cutoff restrictions even for the small inclinations that are typical for limb spicules. Indeed there is now growing observational evidence for transverse waves. We point out the need to understand better the cutoff properties of various kinds of magnetic waves.
Hammer Reiner
Musielak Zdzislaw E.
Nesis Anastasios
Routh Swati
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