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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0028

Investigation of the quiet sun fine-scale structures

plan term


@ @


 name : G. Tsiropula, K. Tziotziou, P. Heinzel @  e-mail : georgia[at]creator.space.noa.gr

contact person in HINODE team

 name : Y.Suematsu @  e-mail : suematsu[at]solar.mtk.nao.ac.jp

 abstract of observational proposal
SCIENTIFIC RATIONALE: The highly inhomogeneous appearance of the quiet Sun is characterized by a rich diversity of fine-scale dynamic structures which have profound effects on the mass and energy flow to the outer solar atmosphere. The principal inhomogeneities are related to roughly cellular patterns that constitute the "network", which is best observed in chromospheric lines and persists throughout the chromosphere-corona transition region and the low corona. The most prominent features residing at the chromospheric network boundaries are mottles and spicules, which are short-lived dynamic events. Over the past decade, apart from the well-known spicules, many complicated and dynamic fine structures have been discovered in  association with the network boundaries, like explosive events, blinkers, network flares, upflow events, H-1A jets. However, their interpretation, inter-relationship and their relation to the underlying photospheric magnetic concentrations remain ambiguous, because the same feature has a different appearance when observed in different spectral lines. For most of the events mentioned above, magnetic reconnection has been suggested as the driving mechanism (Innes et al. 1997, Chae et al.1998, Wilhelm 2000) just like for spicules (Tziotziou et al. 2003). Magnetic reconnection, is probably the most suitable mechanism not only for releasing energy with important implications for the heating of the chromosphere and corona, but also for the transfer of cool gas from the chromosphere to the corona and the solar wind (Tsiropoula and Tziotziou, 2004). The aim of the proposed observations is the comprehension of the dynamical behaviour of mottles/spicules and other fine-scale structures, their association with the magnetic field and their interrelationship, using multiwavelength observations both from the ground and space. These studies are crucial to understanding the dynamics of the solar atmosphere, as well as the role such structures play in the mass balance and heating of the overlying solar atmosphere.

 request to SOT
SOT (1) Broadband filter (FOV = 218h x 109h) Lines of interest: CN I, Ca II H, CH I  (2) Narrowband filter (FOV = 264h x 164h) Lines of interest: Mg Ib, Na I D, Fe I (630.15nm), Fe I (630.25nm), H  (3) Spectropolarimeter Normal map: FOV along slit 164h, slit-scan sampling 0.16h, map area ~ 20h
- In order to study the dynamics of the fine-scale structures we would like to have 2D images taken with the SOT broadband and narrowband filters with a cadence of ~2min.
Regarding the line profiles taken with the NFI: a)  Are these observations simultaneous with the ones taken with the BFI? b) In the various requested lines we should specify how far in the wings we would like to go and how many positions we would like to have along the profiles?  

 request to XRT

 request to EIS
in preparation

 other participating instruments

Duration of the requested ground-based observations: 10 days
Best period: September till mid-October  Best observing conditions during the day: 8 UT - 11 UT and 15 UT – 17 UT -In order to avoid large amount of data from SOT it is possible to consider observations during the best observing conditions of the ground-based instruments i.e. 8 UT - 11 UT and 15 UT – 17 UT

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