Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp53a..03k&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP53A-03
Physics
7507 Chromosphere, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7529 Photosphere
Scientific paper
HINODE Solar Optical Telescope (SOT) discovered ubiquitous occurrence of fine-scale jetlike activities in penumbral chromospheres, which are referred to as penumbral microjets. The microjets' small width of 400 km and short duration of less than 1 min make them difficult to identify in existing ground-based observations. The apparent rise velocity is faster than 50km/s and is roughly comparable to the Alfven speed in the sunspot chromosphere. These properties of penumbral microjets suggest that magnetic reconnection in uncombed magnetic field configuration is the most possible cause of penumbral microjets. In order to understand magnetic configuration associated with penumbral microjets and prove the chromospheric magnetic reconnection hypothesis, we investigated relationship between penumbral microjets seen in CaIIH images and photospheric magnetic fields measured by the HINODE spectro-polarimeter. We found the inclination angles of penumbral microjets measured in CaII H images are roughly consistent with inclination angles of relatively vertical magnetic field component in uncombed magnetic field configuration. In addition, strong and transient downflows are observed in the photosphere near the boundary of a horizontal flux tube associated with a penumbral microjet. The size of the downflow region is about 300km, which is close to the width of penumbral microjets seen in CaII H images. The downflow velocity of several km/s might be a result of an outflow of chromospheric magnetic reconnection and suffer deceleration due to the higher density in the photosphere.
Berger Thomas E.
Ichimoto Kiyoshi
Jurcak Jan
Katsukawa Yukio
Lites Bruce W.
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