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Whistler Waves and Electron Properties in the Inner Heliosphere: Helios Observations

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F20%3A00535838" target="_blank" >RIV/68378289:_____/20:00535838 - isvavai.cz</a>

  • Result on the web

    <a href="https://doi.org/10.3847/1538-4357/ab94a1" target="_blank" >https://doi.org/10.3847/1538-4357/ab94a1</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.3847/1538-4357/ab94a1" target="_blank" >10.3847/1538-4357/ab94a1</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Whistler Waves and Electron Properties in the Inner Heliosphere: Helios Observations

  • Original language description

    We present the analysis of narrowband whistler wave signatures observed in the inner heliosphere (0.3-1 au). These signatures are bumps in the spectral density in the 10-200 Hz frequency range of the AC magnetic field as measured by the search coil magnetometer on board the Helios 1 spacecraft. We show that the majority of whistler signatures are observed in the slow solar wind (<500 km s(-1)) and their occurrence increases with the radial distance (R), from similar to 3% at 0.3 au to similar to 10% at 0.9 au. In the fast solar wind (>600 km s(-1)), whistler activity is significantly lower: whistler signatures start to appear forR > 0.6 au and their number increases from similar to 0.03% at 0.65 au to similar to 1% at 0.9 au. We have studied the variation of the electron core and halo anisotropy (T-e/T-e parallel to), as well as the electron normalized heat flux as a function ofRand of the solar wind speed. We find that, in the slow wind electron core and halo anisotropy is higher than in fast one, and also that these anisotropies increase radially in both types of winds, which is in line with the occurrence of whistler signatures. We hypothesize the existence of a feedback mechanism to explain the observed radial variations of the occurrence of whistlers in relation with the halo anisotropy.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10308 - Astronomy (including astrophysics,space science)

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2020

  • Confidentiality

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

Data specific for result type

  • Name of the periodical

    Astrophysical Journal

  • ISSN

    0004-637X

  • e-ISSN

  • Volume of the periodical

    897

  • Issue of the periodical within the volume

    2

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    15

  • Pages from-to

    118

  • UT code for WoS article

    000551649000001

  • EID of the result in the Scopus database

    2-s2.0-85088592108