Advanced Technology Solar Telescope

Keil, Stephen L.; Rimmelé, Thomas; Wagner, J.

doi:10.1007/s11038-008-9258-7

Cited by 15 publications

(10 citation statements)

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“…In this context, we mention, e.g., the radiative magnetohydrodynamic 3D simulation of sunspot structure by Rempel et al (2009) and the analysis of sunspots observations and simulations from small-scale inhomogeneities towards a global theory carried out by Schlichenmaier (2009) where he concludes that the understanding of the smallscales will be the key to understanding the global structure and the large-scale stability of sunspots. Difficulties and prospects in understanding the coronal magnetic field are reviewed by Cargill (2009), who considered the key observational inputs expected from new generation instruments like the Advanced Technology Solar Telescope (ATST; Keil et al 2009) and the Frequency Agile Solar Radiotelescope (FASR; Bastian 2003), and states that global magnetic field models can provide information on the field in the corona, and towards the Earth through the solar wind, but major challenges for such modelling are the incorporation of small-scale plasma effects.…”

Section: Solar Activity As a Manifestation Of A Chaotic Complex Plasmmentioning

confidence: 99%

Solar Weather Event Modelling and Prediction

et al. 2009

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Key drivers of solar weather and mid-term solar weather are reviewed by considering a selection of relevant physics-and statistics-based scientific models as well as a selection of related prediction models, in order to provide an updated operational scenario for space weather applications. The characteristics and outcomes of the considered scientific and prediction models indicate that they only partially cope with the complex nature of solar activity for the lack of a detailed knowledge of the underlying physics. This is indicated by the fact that, on one hand, scientific models based on chaos theory and non-linear dynamics reproduce better the observed features, and, on the other hand, that prediction models based on statistics and artificial neural networks perform better. To date, the solar weather prediction success at most time and spatial scales is far from being satisfactory, but the forthcoming ground-and space-based high-resolution observations can add fundamental tiles to the modelling and predicting frameworks as well as the application of advanced mathematical approaches in the analysis of diachronic solar observations, that are a must to provide comprehensive and homogeneous data sets.

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Section: Solar Activity As a Manifestation Of A Chaotic Complex Plasmmentioning

confidence: 99%

Solar Weather Event Modelling and Prediction

et al. 2009

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“…Hopefully, this will be possible with future ground-based facilities such as EST (Collados et al 2013) and ATST (Keil et al 2009), or from satellites like Solar-C (Suematsu et al 2012). It would be also interesting to search for these events into realistic magnetohydrodynamic simulations to find out whether there is some kind of relation between their emergence and what occurs in the surrounding medium (see Danilovic et al 2014).…”

Section: Discussionmentioning

confidence: 99%

High speed magnetized flows in the quiet Sun

Noda

Borrero

Suárez

et al. 2014

A&A

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Context. We analyzed spectropolarimetric data recorded with Hinode/SP in quiet-Sun regions located at the disk center. We found single-lobed Stokes V profiles showing highly blue-and red-shifted signals. Oftentimes both types of events appear to be related to each other. Aims. We aim to set constraints on the nature and physical causes of these highly Doppler-shifted signals, as well as to study their spatial distribution, spectropolarimetric properties, size, and rate of occurrence. Also, we plan to retrieve the variation of the physical parameters with optical depth through the photosphere. Methods. We have examined the spatial and polarimetric properties of these events using a variety of data from the Hinode spacecraft. We have also inferred the atmospheric stratification of the physical parameters by means of the inversion of the observed Stokes profiles employing the Stokes Inversion based on Response functions (SIR) code. Finally, we analyzed their evolution using a time series from the same instrument. Results. Blue-shifted events tend to appear over bright regions at the edge of granules, while red-shifted events are seen predominantly over dark regions on intergranular lanes. Large linear polarization signals can be seen in the region that connects them. The magnetic structure inferred from the time series revealed that the structure corresponds to a Ω-loop, with one footpoint always over the edge of a granule and the other inside an intergranular lane. The physical parameters obtained from the inversions of the observed Stokes profiles in both events show an increase with respect to the Harvard-Smithonian reference atmosphere in the temperature at log τ 500 ∈ (−1, −3) and a strong magnetic field, B ≥ 1 kG, at the bottom of the atmosphere that quickly decreases upward until vanishing at log τ 500 ≈ −2. In the blue-shifted events, the LOS velocities change from upflows at the bottom to downflows at the top of the atmosphere. Redshifted events display the opposite velocity stratification. The change of sign in LOS velocity happens at the same optical depth in which the magnetic field becomes zero. Conclusions. The physical mechanism that best explains the inferred magnetic field configuration and flow motions is a siphon flow along an arched magnetic flux tube. Further investigation is required, however, as the expected features of a siphon flow cannot be unequivocally identified.

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“…The ATST will be the flagship facility of the National Solar Observatory (Rimmele et al, 2008;Keil et al 2009Keil et al , 2010. It is an audacious and unprecedented telescope, a 4 m class reflecting telescope with an off-axis Gregorian design and a rotating Coudé lab under the telescope mount.…”

Section: Atstmentioning

confidence: 99%

A view from the ground: Next generation instrumentation for solar and heliospheric physics

Bastian¹

2013

AIP Conference Proceedings

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Articles you may be interested inModeling the global structure of the heliosphere during the recent solar minimum: Model improvements and unipolar streamers AIP Conf.A solar cellular automata model issued from reduced MHD AIP Conf.Abstract. The solar and space physics community has recently completed its second decadal survey under the auspices of the National Research Council. An integrated strategy for ground and space based studies of the Sun and space physics has been recommended, with specific recommendations made regarding new instrumentation, programs, and facilities. The ground based component of these recommendations is briefly reviewed here: the Advanced Technology Solar Telescope (ATST), the Frequency Agile Solar Radiotelescope (FASR), and the Coronal Solar Magnetism Observatory (COSMO). Although not considered as part of the decadal portfolio, but of which the community should nevertheless be aware, are the Atacama Large Millimeter/submillimeter Array (ALMA) and the Jansky Very Large Array (VLA). Several additional instruments are briefly mentioned as pathfinders for those instruments recommended by the decadal survey, including the Coronal Multichannel Polarimeter (CoMP) and the Expanded Owens Valley Solar Array (EOVSA). The planned instruments discussed offer uniquely powerful observations of emissions that originate from the photosphere to well out into the solar wind. As such, they provide observations that are highly complementary to space based missions such as Solar Probe Plus and Solar Orbiter. The status and science goals of the recommended instruments are briefly reviewed. wind PACS: 95.55.Cs, 95.55.Ev, 95.55.Jz 1 http://sites.nationalacademies.org/SSB/ CurrentProjects/SSB_056864 Solar Wind 13

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Advanced Technology Solar Telescope

Cited by 15 publications

References 1 publication

Solar Weather Event Modelling and Prediction

Solar Weather Event Modelling and Prediction

High speed magnetized flows in the quiet Sun

A view from the ground: Next generation instrumentation for solar and heliospheric physics

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