Динамика магнитных полей в областях корональных дыр Беневоленская Е.Е., Понявин Ю. Д. ГАО РАН.

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Presentation transcript:

Динамика магнитных полей в областях корональных дыр Беневоленская Е.Е., Понявин Ю. Д. ГАО РАН

Мы представляем результаты исследования динамики магнитных полей в областях пониженной плотности короны (корональных дырах) используя данные космических обсерваторий: Solar and Heliospheric Observatory ( SOHO) и Solar Dynamics Observatory (SDO). Магнитные данные представлены в виде компоненты магнитного поля по-лучу-зрения как для SOHO/MDI(Michelson Doppler imager) так и для SDO/HMI(Helioseismic and Magnetic Imager). Корональные данные в эмиссионных линиях крайнего ультрафиолета (193А, 195A, 284A) хорошо выявляют структуру и эволюцию корональных дыр и позволяют сопоставить их с динамикой магнитного поля на солнечном диске(SOHO/EIT, SDO/AIA). В крупномасштабном магнитном поле корональная дыра, обычно, оказываетя либо положительной либо отрицальной полярности, в то время как мелкомастабное магнитное поле показывает довольно сложную динамику. Мы обсуждаем влияние фильтрации магнитного поля и ее роль в определении динамики мелкомасштабного магнитного поля.

SOHO/MDI

Magnetic flux of small scale elements inside and outside the Coronal holes

Left panel : EIT synoptic frame in line FeXII (195A) on , 19:00UT. Right panel : Coronal hole inferred form EIT image. Two rectangular show boxes Inside the coronal hole (Box 1) and outside (Box 2). Box 2 Box 1

Box 2 Box 1 Box 2 Left panel : Magnetic frame for CR 1967, longitude of central meridian Is 177 deg. Right panels : magnetic frames in relative longitudes ( 0 deg correspondents to central meridian).

Box 2 Box 1 Left panel : EIT synoptic frame in line FeXII (195A) on , 13:00UT. Right panel : Coronal hole infrerred form EIT image. Two rectangular show boxes Inside the coronal hole (Box 1) and outside (Box 2).

Box 2 Box 1 Box 2 Left panel : Magnetic frame for CR 1967, longitude of central meridian Is 154 deg. Right panels : magnetic frames in relative longitudes ( 0 deg correspondents to central meridian).

Statistics for magnetic elements inside and outside coronal hole. The magnetic flux, area and number of magnetic elements (|B|>20 Gauss) are estimated inside Box 1 and Box 2 for 5 cases during the evolution of the coronal hole started on 16 September 2000, 19:00UT (Longitude of central meridian was 177 deg) and ended on 18 September 2000, 13:00UT (Longitude of central meridian was 154 deg). Size of box is 20 deg in longitude with step 0.1 deg and from 0.64 to 0.8 in sine latitude with step Box’s Area is about 2.7*10^20 cm^2. Outside the coronal hole (Box 2) Inside the coronal hole (Box 1) Relative area of positive polarity is about 51.7±0.7% 45.2±1.1% Total magnetic flux: (1.537±0.035)*10^21 Mx (1.9616±0.0361)*10^21 Mx Relative positive flux: 45.6±1.7% 27.6±1.1% Magnetic elements |B|>20Gauss Relative area of positive polarity is about 0.24±0.16% 0.19±0.06% Relative area of negative polarity is about 1.25±0.16% 3.7±0.1% Relative positive flux: 17.8±5.5% 2.9±.1% In both bases negative magnetic flux is dominated. The dominant negative magnetic flux in Coronal hole mostly comes from the evolving magnetic structures (faculae or plages).

SDO /AIA and SDO/HMI data for coronal holes investigations.

Channel namePrimary ion(s) Region of atmosphere * Char. log(T) white lightcontinuum photosphere Åcontinuum temperature minimum, photosphere ÅHe II chromosphere, transition region ÅC IV+cont. transition region + upper photosphere ÅFe IX quiet corona, upper transition region ÅFe XII, XXIV corona and hot flare plasma 6.1, ÅFe XIV active-region corona ÅFe XVI active-region corona ÅFe XVIII flaring regions (partial readout possible) ÅFe VIII, XX, XXIII flaring regions (partial readout possible) 5.6, 7.0, 7.2 AIA ( ATMOSPHERIC IMAGING ASSEMBLY )

I II

I

I

Выводы The dominant magnetic flux in Coronal hole mostly comes from the evolving magnetic structures (faculae or plages). It is observed the growth of the dominant polarity inside the coronal holes, while the total magnetic flux is decreasing.