Numerical simulations of conversion to Alfvén waves in solar active regions
We study the coupling of magneto-acoustic waves to Alvén waves using 2.5D numerical simulations. In our experiment, a fast magnetoacoustic wave of a given frequency and wavenumber is generated below the surface. The magnetic field in the domain is assumed homogeneous and inclined. The efficiency of...
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| Veröffentlicht in: | Journal of physics. Conference series 2011-01, Vol.271 (1), p.012042-4 |
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| creator | Khomenko, E Cally, P S |
| description | We study the coupling of magneto-acoustic waves to Alvén waves using 2.5D numerical simulations. In our experiment, a fast magnetoacoustic wave of a given frequency and wavenumber is generated below the surface. The magnetic field in the domain is assumed homogeneous and inclined. The efficiency of the conversion to Alfvén waves near the layer of equal acoustic and Alfven speeds is measured calculating their energy flux. The particular amplitude and phase relations between the oscillations of magnetic field and velocity help us to demonstrate that the waves produced after the transformation and reaching upper atmosphere are indeed Alfvén waves. We find that the conversion from fast magneto-acoustic waves to Alfvén waves is particularly important for the inclination θ and azimuth φ angles of the magnetic field between 55 and 65 degrees, with the maximum shifted to larger inclinations for lower frequency waves. The maximum Alfvén flux transmitted to the upper atmosphere is about 2-3 times lower than the corresponding acoustic flux. |
| doi_str_mv | 10.1088/1742-6596/271/1/012042 |
| format | Article |
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In our experiment, a fast magnetoacoustic wave of a given frequency and wavenumber is generated below the surface. The magnetic field in the domain is assumed homogeneous and inclined. The efficiency of the conversion to Alfvén waves near the layer of equal acoustic and Alfven speeds is measured calculating their energy flux. The particular amplitude and phase relations between the oscillations of magnetic field and velocity help us to demonstrate that the waves produced after the transformation and reaching upper atmosphere are indeed Alfvén waves. We find that the conversion from fast magneto-acoustic waves to Alfvén waves is particularly important for the inclination θ and azimuth φ angles of the magnetic field between 55 and 65 degrees, with the maximum shifted to larger inclinations for lower frequency waves. 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The maximum Alfvén flux transmitted to the upper atmosphere is about 2-3 times lower than the corresponding acoustic flux.</description><subject>Acoustics</subject><subject>Computer simulation</subject><subject>Conversion</subject><subject>Flux</subject><subject>Magnetic domains</subject><subject>Magnetic fields</subject><subject>Magnetoacoustic waves</subject><subject>Magnetohydrodynamics</subject><subject>Mathematical models</subject><subject>Physics</subject><subject>Solar activity</subject><subject>Upper atmosphere</subject><subject>Wavelengths</subject><issn>1742-6596</issn><issn>1742-6588</issn><issn>1742-6596</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp9kN1KxSAAgCUKOp16hRC66WYddc6fy8OhPzjUTV2Lcy522ObSbdEj9Ry9WI5FRUTeqPh9Kh8ApxhdYCTECnNKEpZJtiIcr_AKYYIo2QOLr4P9H-tDcBTCDqE0Dr4A27uhsb4yuoahaoZa95VrA3QlNK4drQ9xC3sH13U5vr-18EWPNsCqhcHV2kNt-mq00NunSTsGB6Wugz35nJfg8eryYXOTbO-vbzfrbWIopX1SIi7SLGepJsimNLMFKfIMEUtsKos8l4KIwlrBJS8lKlJdMGxSYozAnOXRXYLz-d7Ou-fBhl41VTC2rnVr3RAU5lhIRmmWRfTsF7pzg2_j7xTJuCRMUskixWbKeBeCt6XqfNVo_6owUlNkNfVTUz8VIyus5shRTGaxct238yeruqKMPP6D__-ND-Bvi78</recordid><startdate>20110101</startdate><enddate>20110101</enddate><creator>Khomenko, E</creator><creator>Cally, P S</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7U5</scope><scope>8BQ</scope><scope>JG9</scope></search><sort><creationdate>20110101</creationdate><title>Numerical simulations of conversion to Alfvén waves in solar active regions</title><author>Khomenko, E ; Cally, P S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c444t-f07835b63a20e345ed2db502e2e39dbb9828dee8797f90d3ad61c32cc8176b783</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Acoustics</topic><topic>Computer simulation</topic><topic>Conversion</topic><topic>Flux</topic><topic>Magnetic domains</topic><topic>Magnetic fields</topic><topic>Magnetoacoustic waves</topic><topic>Magnetohydrodynamics</topic><topic>Mathematical models</topic><topic>Physics</topic><topic>Solar activity</topic><topic>Upper atmosphere</topic><topic>Wavelengths</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Khomenko, E</creatorcontrib><creatorcontrib>Cally, P S</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Materials Research Database</collection><jtitle>Journal of physics. 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| subjects | Acoustics Computer simulation Conversion Flux Magnetic domains Magnetic fields Magnetoacoustic waves Magnetohydrodynamics Mathematical models Physics Solar activity Upper atmosphere Wavelengths |
| title | Numerical simulations of conversion to Alfvén waves in solar active regions |
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