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Observations of Chromospheric Anemone Jets with Hinode SOT and Hida Ca II Spectroheliogram  

Satoshi Morita   Submitted: 2010-02-11 09:04

We present the first simultaneous observations of chromospheric ''anemone'' jets in solar active regions with Hinode SOT Ca II H broadband filetergram and Ca II K spetroheliogram on the Domeless Solar Telescope (DST) at Hida Observatory. During the coordinated observation, 9 chromospheric anemone jets were simultaneously observed with the two instruments. These observations revealed three important features, i.e.: (1) the jets are generated in the lower chromosphere, i.e. these cannot be seen in Ca II K3, (2) the length and lifetime of the jets are 0.4-5 Mm and 40-320 sec, (3) the apparent velocity of the jets with Hinode SOT are 3-24 km s-1, while Ca II K3 component at the jets show blueshifts (in 5 events) in the range of 2- 6 km s-1. The chromospheric anemone jets are associated with mixed polarity regions which are either small emerging flux regions or moving magnetic features. It is found that the Ca II K line often show red or blue asymmetry in K2/K1 component: the footpoint of the jets associated with emerging flux regions often show redshift (2-16 km s-1), while the one with moving magnetic features show blueshift (around 5 km s-1). Detailed analysis of magnetic evolution of the jet foaming regions revealed that the reconnection rate (or canceling rate) of the total magnetic flux at the footpoint of the jets are of order of 1016 Mx/s, and the resulting magnetic energy release rate (1.1-10) x 1024 erg/s, with the total energy release (1-13) x 1026 erg for the duration of the magnetic cancellations, 130s. These are comparable to the estimated total energy, 1026 erg, in a single chromospheric anemone jet. In addition to Hida DST Ca II-K Spectroheliogram and Hinode SOT Ca II H broadband filetergram, we also used Hinode SOT magnetogram as well as Hida Hα filtergram. An observation-based physical model of the jet is presented. The relation between chromospheric anemone jets and Ellerman bombs is discussed.

Authors: Morita, S., Shibata, K., Ueno, S., Ichimoto, K., Kitai, R., and Otsuji, K.
Projects: Hinode/SOT

Publication Status: PASJ (accepted)
Last Modified: 2010-02-11 13:33
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Observations of Chromospheric Anemone Jets with Hinode SOT and Hida Ca II Spectroheliogram

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