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Do the solar cycle effects explain different flows in the heliosheath observed by voyager 1 and 2?тезисы доклада
- Авторы: Provornikova E.A., Merav Opher, Vladislav Izmodenov, Richardson John D., Gabor Toth
- Сборник: American Geophysical Union (AGU) 2013 Fall Meeting
- Серия: Proceedings of AGU Fall Meeting
- Том: 1
- Тезисы
- Год издания: 2013
- Издательство: American Geophysical Union
- Местоположение издательства: United States
- Аннотация: In-situ observations of plasma in the heliosheath by Voyager 1 (V1) and Voyager 2 (V2) show very different behavior of the flows. The average radial velocity measured at V2 remains around 110 km/s. The non-radial components have increased as the plasma flow turns toward the heliotail. Plasma velocity components determined from V1 LECP data decreased across the heliosheath and from the end of 2010 to mid-2012 had near zero values. In this work we explore the role of the 11-year solar cycle variations of the solar wind on the plasma flows in the heliosheath (within first 30 AU of the termination shock) using a new 3D time-dependent model of the interaction between the solar wind and the interstellar medium. The model takes into account realistic time and latitudinal changes of the solar wind parameters at 1 AU derived from SOHO/SWAN and IPS observations. The solar cycle model predicts a constant radial flow along the V2 direction which is consistent with observations. This prediction is different from the steady state models that predict a 30% decrease. The model shows that in the heliosheath V2 was immersed in variable (by 50 km/s in speed) wind that has a speed 450-550 km/s upstream the TS. Contrary to observations, our model produces a constant radial velocity at V1 (similar to V2) that indicates that solar cycle effects do not explain different flows observed at V1 and V2 and thus other effects should be explored in the models. Also we compare the meridional (VN) and azimuthal (VT) flows: the modeled VN are higher than observed and the modeled VT at V2 is smaller than observed. Possible reasons of these differences are discussed. CONTROL ID: 1803884, SH11A-1968.
- Добавил в систему: Измоденов Владислав Валерьевич