Conjugate Observations of Quasiperiodic Emissions by the Van Allen Probes Spacecraft and Ground-based Station Kannuslehto

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F20%3A00536255" target="_blank" >RIV/68378289:_____/20:00536255 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/20:10413875

Result on the web

<a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA027793" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA027793</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2020JA027793" target="_blank" >10.1029/2020JA027793</a>

Result language

angličtina

Original language name

Conjugate Observations of Quasiperiodic Emissions by the Van Allen Probes Spacecraft and Ground-based Station Kannuslehto

Original language description

Whistler mode waves observed in the Earth's inner magnetosphere at frequencies between about 0.5 and 4 kHz which exhibit a nearly periodic time modulation of the wave intensity are called quasiperiodic (QP) emissions. Conjugate measurements of QP events at several different locations can be used to estimate their spatial extent and spatiotemporal variability. Results obtained using conjugate QP measurements provided by the ground-based station Kannuslehto (L approximate to 5.5) and the Van Allen Probes spacecraft (L shells between about 1.1 and 6.5) between September 2012 and November 2017 are presented. Altogether, 26 simultaneously detected events were analyzed. The event modulation periods and frequency-time structures were generally the same at all observation points. Spatial separations of the spacecraft and the ground-based station during conjugate observations are typically within about 40 degrees in azimuth and from about 1 to 3 in L shell. RBSP consistently observes events at lower L shells than Kannuslehto, with the event occurrence primarily inside of the plasmasphere. Ratios of Poynting fluxes observed by the spacecraft and on the ground are used to evaluate event intensity variations related to the spacecraft position. It is found that the intensity decreases considerably both at low L shells and outside of the plasmasphere. Finally, an event containing a gap in its frequency-time structure related to a sudden change of its properties is analyzed in detail.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Journal of Geophysical Research: Space Physics

ISSN

2169-9380

e-ISSN

—

Volume of the periodical

125

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

e2020JA027793

UT code for WoS article

000545696000015

EID of the result in the Scopus database

2-s2.0-85087064080