Arcetri Astrophysical Observatory

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Corona & solar wind


Sources of solar wind:


Since 1973, when Krieger et al. identified a coronal hole as the source of a high speed stream, people have been searching for localized regions, within holes, where fast wind might originate. As for sources of slow wind, these are, as of today, not fully identified. In this research area, Arcetri is involved along different lines:xrt standard jet in 2 diff filters

 

 

  • Hinode, STEREO, SDO have shown that X-ray jets are, in coronal holes, much more numerous than predicted on the basis of previous observations. These are small-scale, short lived ejections, that resemble larger scale flare events. A question we are trying to answer is: do X-ay jets contribute to the mass and energy flux of the wind?Satellite studies, within this area, focus on the nature of jets, on their physical parameters (that can be identified via spectroscopic techniques), and their evolution in time and spatially along the ejection, and extend to other transient CHs structures (e.g. plumes) and their role in solar wind origin and maintenance.

 

Images of the jet that occurred in the southern polar CH on July 1, 2008, and was imaged by HINODE/XRT in two filters

 

171 vel5dec1997

 

 

  • One of the slow wind sources may reside at the edge of Active Regions (ARs), as scintillation measurements had suggested. Space experiments, like HINODE, allowed observations of ARs in the low corona, revealing the occurrence of outflows, whose behavior at higher levels is, however, difficult to predict: is outflowing plasma falling back or does it become part of the wind? In this area we analyze data acquired by UVCS/SOHO at high coronal levels (order of 2 solar radii) above Active Regions, to examine whether outflows reach these altitudes, hence supporting the hypothesis that one of the slow wind components originate from ARs.
    Long-term behavior of these flows, over an AR lifetime, or over a solar cycle, are further issues that can be examined.

Images of the jet that occurred in the southern polar CH on July 1, 2008, and was imaged by HINODE/XRT in two filters.

Solar physics group



The Arcetri Astrophysical Observatory (OAA), part of the National Institute of Astrophysics (INAF), has a long tradition of solar physics studies, initiated more than a century ago. Nowadays, these continue with a number of researchers involved in solar and plasma physics issues, divided between the Observatory and the  Astronomy and Space Sciences Department of the  University of Firenze.

Scientific expertise includes solar surface magnetism, studies of explosive phenomena, solar instrumentation, and theory of the generation and transfer of polarised radiation in the solar atmosphere and the solar corona. Some of these topics are described in  more detail below.


 

Group Members

 

Name

Position

InstituteTelephoneemail
Gianna CauzziResearcherINAF - Arcetri+39 055 2752 260This email address is being protected from spambots. You need JavaScript enabled to view it.
Giannina PolettoAssociateINAF - Arcetri+39 055 2752 252This email address is being protected from spambots. You need JavaScript enabled to view it.
Egidio Landi Degli InnocentiFull PofessorUniversity of Florence+39 055 205 5223This email address is being protected from spambots. You need JavaScript enabled to view it.
Marco Romoli ResearcherUniversity of Florence+39 055 205 5233This email address is being protected from spambots. You need JavaScript enabled to view it.
Marco VelliAssociate ProfessorUniversity of Florence+39 055 205 5243This email address is being protected from spambots. You need JavaScript enabled to view it.
Simone LandiResearcherUniversity of Florence+39 055 205 5224This email address is being protected from spambots. You need JavaScript enabled to view it.
Federico LandiniPostDocINAF - Arcetri+39 055 205 5221This email address is being protected from spambots. You need JavaScript enabled to view it.
Mauro FocardiPostDocINAF - Arcetri+39 055 205 5213This email address is being protected from spambots. You need JavaScript enabled to view it.
Maurizio PancrazziPostDocINAF - Arcetri+39 055 205 5230This email address is being protected from spambots. You need JavaScript enabled to view it.
Stefano PucciPhD studentUniversity of Florence+39 055 205 5206This email address is being protected from spambots. You need JavaScript enabled to view it.
Andrea VerdiniPostDocUniversity of Florence This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Research Topics:

Optical instrumentation: the Interferometric BIdimensional Spectropolarimeter (IBIS) 

Thecnology and Instrumentation for Astrophysics

Corona and Solar Wind - Space based observation of the extended solar atmosphere 

Spectropolarimetry - Polarization of the radiation emitted by objects of astrophysical interest 

High Resolution Solar Studies - Observation of the solar photosphere and chromosphere at high resolutions 

Arcetri Space Astrophisical Plasmas

 

Projects:

METIS - Solar Orbiter

SOLARNET

F-CHROMA

ATST

EST

HERSCHEL/SCORE II

 SOLAR PROBE

Solar Physics Group Members        
!-- News and Updates - IBIS First Light! -->             IBIS        
Related Projects        
Publications        
Research Topics        
        Corona and Solar WindSpace-based observations of the extended solar atmosphere        
        High Resolution Solar StudiesObservations of the solar photosphere and chromosphere at high resolutions        
        Solar ActivityStudies of the solar chromospheric response to flares        
        !-- Solar Instrumentation
-->              Solar Instrumentation
Innovative interferometric instruments for bi-dimensional solar spectroscopy        
        SpectropolarimetryPolarization of the radiation emitted by objects of astrophysical interest        
                        Atmospheric Refraction code available here.        



Projects             
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UVCS    cfa-www.harvard.edu/uvcs/    The Observatory of Arcetri participates in the analysis of the data obtained           from the Ultraviolet Coronagraph Spectrometer (UVCS) operating on the            SOHO spacecraft.    
THEMIS    www.themis.iac.es    The Observatory of Arcetri was responsible for designing and        building the Italian       Panoramic Monochromator installed at THEMIS and participates       in observing runs using the range of THEMIS instruments    
ESMN    esmn.astro.uu.nl    The European Solar Magnetism Network (ESMN) is a             Research Training Network    Funded by the European Commission that links together     11 european    institutes to perform coordinated studies of solar magnetic fields using    ground and space-based observations as well as theoretical interpretation.    
ATST    atst.nso.edu    The Observatory of Arcetri is part of a group of italian and european institutes       evaluating a european participation in the design and construction of        the Advanced Technology Solar Telescope.