Statistické vlastnosti Langmuirových vln o malé amplitudě v oblasti před zemskou rázovou vlnou

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F07%3A00306317" target="_blank" >RIV/68378289:_____/07:00306317 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Statistical properties of small-amplitude Langmuir waves in the Earth?s electron foreshock

Popis výsledku v původním jazyce

We present the results of a statistical study of Langmuir waves observed by the Cluster spacecraft in the Earth?s electron foreshock. To classify the probability density distributions of the logarithms of the wave energies, Pearson technique is used. Weshow that experimental distributions can be better approximated by Beta distribution or Pearson Type IV distribution rather than by a normal distribution predicted by the stochastic growth theory. This conclusion agrees with the results of numerical simulations that were previously performed with the use of a model for Langmuir wave propagation in unstable plasma with random inhomogeneities. The main reason for deviations of empirical distributions from a normal distribution is probably related to the effective number of regions, where the waves grow, which is not sufficiently large for the central limit theorem to be applicable. For two of seven events such deviations may be partially attributed to the effects of thermal Langmuir waves

Název v anglickém jazyce

Statistical properties of small-amplitude Langmuir waves in the Earth?s electron foreshock

Popis výsledku anglicky

We present the results of a statistical study of Langmuir waves observed by the Cluster spacecraft in the Earth?s electron foreshock. To classify the probability density distributions of the logarithms of the wave energies, Pearson technique is used. Weshow that experimental distributions can be better approximated by Beta distribution or Pearson Type IV distribution rather than by a normal distribution predicted by the stochastic growth theory. This conclusion agrees with the results of numerical simulations that were previously performed with the use of a model for Langmuir wave propagation in unstable plasma with random inhomogeneities. The main reason for deviations of empirical distributions from a normal distribution is probably related to the effective number of regions, where the waves grow, which is not sufficiently large for the central limit theorem to be applicable. For two of seven events such deviations may be partially attributed to the effects of thermal Langmuir waves

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2007

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Planetary and Space Science

ISSN

0032-0633

e-ISSN

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Svazek periodika

55

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

2273-2280

Kód UT WoS článku

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EID výsledku v databázi Scopus

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