Quote:
|
Originally Posted by A.DIM
However, it remains a mystery how the high energy electrons which produce the radio emission are continuously accelerated into the magnetic poles of the dwarf.
|
Just a brief thought. Hultqvist might have a *possible* / tentative explanation, derived from known / newly measured terrestrial auroral physics.
(On the importance of auroral processes in the Universe.)
http://dx.doi.org/10.1016/j.jastp.2008.03.023
Unfortunately, it requires like $30-35 to download. I wish science were actually available to John Q Public rather than sequestered in ivory towers, but
c'est la vie, non?
Quote:
Acceleration of charged particles in magnetic field-aligned electric potential differences at Earth and at the outer planets in the solar system is summarized and its general importance in the Universe is briefly discussed.
The role of field-aligned currents, driven by parallel electric fields, in causing filamentary structure in stellar atmospheres is briefly reviewed.
The differences between auroral optical emissions at various planets are summarized.
The important role of field-aligned potential differences in the generation of AKR and corresponding emissions from other objects is discussed.
Finally, aurora-associated processes for ejection of planetary plasma into space are briefly reviewed.
|
It's an interesting article, if you've got access. Tentative, but interesting. Notes that the electron-cyclotron maser instability may give us a window into how auroras and other processes in the universe operate, since many seem to produce radio emissions similar to if not the same as that produced by the aforementioned plasma process.
See also:
(Sporadic Long-term Variability in Radio Activity from a Brown Dwarf)
http://arxiv.org/PS_cache/arxiv/pdf/...707.0634v1.pdf
Quote:
|
... We discuss this large variability in the radio emission within the context of both gyrosynchrotron emission and the electron-cyclotron maser, favoring the latter mechanism.
|
and
(Confirmation of the Electron Cyclotron Maser Instability as the Dominant Source of Radio Emission from Very Low Mass Stars and Brown Dwarfs)
http://adsabs.harvard.edu/abs/2008arXiv0805.4010H
Quote:
|
We report on radio observations of the M8.5 dwarf LSR J1835+3259 and the L3.5 dwarf 2MASS J00361617+1821104, which provide the strongest evidence to date that the electron cyclotron maser instability is the dominant mechanism producing radio emission in the magnetospheres of ultracool dwarfs ...
|
Regards,
~Michael