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| Titel |
Faith in a seed: on the origins of equatorial plasma bubbles |
| VerfasserIn |
J. M. Retterer, P. Roddy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 5 ; Nr. 32, no. 5 (2014-05-15), S.485-498 |
| Datensatznummer |
250121056
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| Publikation (Nr.) |
 copernicus.org/angeo-32-485-2014.pdf |
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| Zusammenfassung |
Our faith in the seeds of equatorial plasma irregularities holds that there
will generally always be density perturbations sufficient to provide the
seeds for irregularity development whenever the Rayleigh–Taylor instability
is active. When the duration of the time of the Rayleigh–Taylor instability is
short, however, the magnitude of the seed perturbations can make a difference
in whether the irregularities have a chance to grow to a strength at which
the nonlinear development of plumes occurs. In addition, the character of the
resulting irregularities reflects the characteristics of the initial seed
density perturbation, e.g., their strength, spacing, and, to some extent, their
spatial scales, and it is important to know the seeds to help determine the
structure of the developed irregularities. To this end, we describe the
climatology of daytime and early-evening density irregularities that can
serve as seeds for later development of plumes, as determined from the Planar Langmuir Probe (PLP)
plasma density measurements on the C/NOFS (Communication and Navigation Outage Forecast System) satellite mission,
presenting their magnitude as a function of altitude, latitude, longitude,
local time, season, and phase in the solar cycle (within the C/NOFS
observation era). To examine some of the consequences of these density
perturbations, they are used as initial conditions for the PBMOD
PBMOD (Retterer, 2010a) 3-D irregularity model to follow their potential
development into larger-amplitude irregularities, plumes, and radio
scintillation.
"Though I do not believe that a pla[sma bubble] will spring up where no
seed has been, I have great faith in a seed. Convince me that you have a seed
there, and I am prepared to expect wonders." – Henry David Thoreau |
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