Unexpected Behavior of the SolarWind Mass Flux During Solar Maxima: Two Peaks at Middle Heliolatitudesстатья
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Дата последнего поиска статьи во внешних источниках: 19 марта 2019 г.
Аннотация:In this work we study the temporal and latitudinal variations of the solar wind mass flux at 1 AU derived from SOHO/SWAN data on backscattered solar Lyman-radiation in 1996 – 2018. Previously Katushkina et al. (J. Geophys. Res.118, 2800, 2013) have shown that the latitudinal profiles of the solar wind mass flux during the solar maximum 2001 – 2003 have two separate peaks at middle heliolatitudes. In this work we provide the data for the last solar maximum in 2014 – 2016 and show that the specific latitudinal distribution appears again. However, in 2014 – 2016 the two peaks are less separated and sometimes merged to one peak. For several years we have performed a comparison of SWAN observations with the results of theWSA-Enlil model, which is a coupled 3D time-dependent model
of the solar wind propagation from the solar corona to the heliosphere. It is shown that the
WSA-Enlil model confirms qualitatively the latitudinal distribution of the solar wind found
from the SWAN data, although there are some quantitative differences. Physical reasons for
the formation of this latitudinal structure at the solar maxima are discussed. Further investi
gation is needed and could provide new links between the solar corona and the heliospheric
environment.