The electron temperature and anisotropy in the solar wind. Comparison of the core and halo populations

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00462963" target="_blank" >RIV/68378289:_____/16:00462963 - isvavai.cz</a>

Alternative codes found

RIV/67985815:_____/16:00463539

Result on the web

<a href="http://dx.doi.org/10.1007/s11207-016-0961-7" target="_blank" >http://dx.doi.org/10.1007/s11207-016-0961-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-016-0961-7" target="_blank" >10.1007/s11207-016-0961-7</a>

Result language

angličtina

Original language name

The electron temperature and anisotropy in the solar wind. Comparison of the core and halo populations

Original language description

Estimating the temperature of solar wind particles and their anisotropies is particularly important for understanding the origin of their deviations from thermal equilibrium and the effects this has. In the absence of energetic events, the velocity distribution of electrons reveals a dual structure with a thermal (Maxwellian) core and a suprathermal (kappa) halo. This article presents a detailed observational analysis of these two components, providing estimations of their temperatures and temperature anisotropies, and decoding any potential interdependence that their properties may indicate. The dataset used in this study includes more than 120 000 of the distributions measured by three missions in the ecliptic within an extended range of heliocentric distances from 0.3 to over 4 AU. The core temperature is found to decrease with the radial distance, while the halo temperature slightly increases, clarifying an apparent contradiction in previous observational analyses and providing valuable clues about the temperature of the kappa-distributed populations. For low values of the power-index kappa, these two components manifest a clear tendency to deviate from isotropy in the same direction, which seems to confirm the existence of mechanisms with similar effects on both components, e.g., the solar wind expansion, or the particle heating by the fluctuations. However, the existence of plasma states with anticorrelated anisotropies of the core and halo populations and the increase in their number for high values of the power-index kappa suggest a dynamic interplay of these components, mediated, most probably, by the anisotropy-driven instabilities.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BL - Plasma physics and discharge through gases

OECD FORD branch

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Project

<a href="/en/project/GA15-17490S" target="_blank" >GA15-17490S: Control mechanisms of the electron heat flux in the solar wind</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

Solar Physics

ISSN

0038-0938

e-ISSN

—

Volume of the periodical

291

Issue of the periodical within the volume

7

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

2165-2179

UT code for WoS article

000382094000014

EID of the result in the Scopus database

2-s2.0-84982840942