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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Voyager 1/UVS measurements of the backscattered solar Lyman-alpha emission at the distant heliosphere: unknown source of additional emissionтезисы доклада
- Авторы: Katushkina Olga, Alexashov Dmitry, Sandel Bill R., Izmodenov Vladislav, Quemerais Eric
- Сборник: COSPAR 41st Scientific Assembly Abstracts
- Серия: COSPAR SA
- Том: 41
- Тезисы
- Год издания: 2016
- Место издания: SAO/NASA ADS USA
- Первая страница: D1.1-11-16
- Аннотация: Voyager 1/UVS has been performing measurements of the backscattered solar Lyman-alpha intensities for more than 35 years at distances 5-130 AU from the Sun. Backscattered Lyman-alpha emission depends on the interstellar hydrogen distribution in the solar wind / LISM interaction region. Therefore, measurement of the Lyman-alpha intensities is a tool for remote sensing of the hydrogen parameters at the heliospheric boundary. It is interesting to study dependence of the Lyman-alpha intensities on distance from the Sun. Namely, the Voyager 1 data show decrease of intensity (after correction for the solar flux variations) from 5 to 90 AU (1979-2003), then almost constant intensity between 90 and 115 AU (2003-2011), and decrease of intensity again at 115-130 AU (2011-2014). We perform numerical modeling and an analysis of the data by using our kinetic-MHD heliospheric model (Izmodenov & Alexashov, 2015) and the radiative transfer code (Quemerais, 2000). It is shown that the data obtained up to 90 AU (before 2003) can be fitted by the model quite well. After that the model predicts decrease of intensity, while the data show almost constant values. This behavior can be explained by addition to the model some portion of isotropic "extraheliospheric" Lyman-alpha emission, which does not scattered in the heliosphere and does not depend on the solar Lyman-alpha flux. http://adsabs.harvard.edu/abs/2016cosp...41E.959K
- Добавил в систему: Измоденов Владислав Валерьевич