THIN CURRENT SHEETS AND ASSOCIATED ELECTRON HEATING IN TURBULENT SPACE PLASMA
ABSTRACT Intermittent structures, such as thin current sheets, are abundant in turbulent plasmas. Numerical simulations indicate that such current sheets are important sites of energy dissipation and particle heating occurring at kinetic scales. However, direct evidence of dissipation and associated...
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| Veröffentlicht in: | Astrophysical journal. Letters 2015-05, Vol.804 (1), p.1-5 |
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| creator | Chasapis, A. Retinò, A. Sahraoui, F. Vaivads, A. Khotyaintsev, Yu. V. Sundkvist, D. Greco, A. Sorriso-Valvo, L. Canu, P. |
| description | ABSTRACT Intermittent structures, such as thin current sheets, are abundant in turbulent plasmas. Numerical simulations indicate that such current sheets are important sites of energy dissipation and particle heating occurring at kinetic scales. However, direct evidence of dissipation and associated heating within current sheets is scarce. Here, we show a new statistical study of local electron heating within proton-scale current sheets by using high-resolution spacecraft data. Current sheets are detected using the Partial Variance of Increments (PVI) method which identifies regions of strong intermittency. We find that strong electron heating occurs in high PVI (>3) current sheets while no significant heating occurs in low PVI cases (5) show the strongest heating and most of the time are consistent with ongoing magnetic reconnection. This suggests that reconnection is important for electron heating and dissipation at kinetic scales in turbulent plasmas. |
| doi_str_mv | 10.1088/2041-8205/804/1/L1 |
| format | Article |
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V. ; Sundkvist, D. ; Greco, A. ; Sorriso-Valvo, L. ; Canu, P.</creator><creatorcontrib>Chasapis, A. ; Retinò, A. ; Sahraoui, F. ; Vaivads, A. ; Khotyaintsev, Yu. V. ; Sundkvist, D. ; Greco, A. ; Sorriso-Valvo, L. ; Canu, P.</creatorcontrib><description>ABSTRACT Intermittent structures, such as thin current sheets, are abundant in turbulent plasmas. Numerical simulations indicate that such current sheets are important sites of energy dissipation and particle heating occurring at kinetic scales. However, direct evidence of dissipation and associated heating within current sheets is scarce. Here, we show a new statistical study of local electron heating within proton-scale current sheets by using high-resolution spacecraft data. Current sheets are detected using the Partial Variance of Increments (PVI) method which identifies regions of strong intermittency. We find that strong electron heating occurs in high PVI (>3) current sheets while no significant heating occurs in low PVI cases (<3), indicating that the former are dominant for energy dissipation. Current sheets corresponding to very high PVI (>5) show the strongest heating and most of the time are consistent with ongoing magnetic reconnection. 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Current sheets are detected using the Partial Variance of Increments (PVI) method which identifies regions of strong intermittency. We find that strong electron heating occurs in high PVI (>3) current sheets while no significant heating occurs in low PVI cases (<3), indicating that the former are dominant for energy dissipation. Current sheets corresponding to very high PVI (>5) show the strongest heating and most of the time are consistent with ongoing magnetic reconnection. This suggests that reconnection is important for electron heating and dissipation at kinetic scales in turbulent plasmas.</description><subject>ACCELERATION</subject><subject>acceleration of particles</subject><subject>Astrophysics</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Computational fluid dynamics</subject><subject>COMPUTERIZED SIMULATION</subject><subject>COSMIC ELECTRONS</subject><subject>COSMIC PROTONS</subject><subject>Current sheets</subject><subject>Dissipation</subject><subject>Energy dissipation</subject><subject>ENERGY LOSSES</subject><subject>HEATING</subject><subject>MAGNETIC FIELDS</subject><subject>MAGNETIC RECONNECTION</subject><subject>Physics</subject><subject>PLASMA</subject><subject>Plasma Physics</subject><subject>Plasmas</subject><subject>RESOLUTION</subject><subject>SHEETS</subject><subject>SPACE</subject><subject>SPACE VEHICLES</subject><subject>Spacecraft</subject><subject>TURBULENCE</subject><issn>2041-8205</issn><issn>2041-8213</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqNkl1v0zAUhqMJpI3BH9hVJG5AIquPP2L70qRhqZSlU5Pu1krchGZ0dYkTEP-eZJkmcQNc-ejoeV5Zeo_nXQG6BiTEAiMKgcCILQSiC1ikcOZdPC-BvHqZETv33jj3gBBGIYgL77ZIVpkfbTebOCv8PInjIvdVtvRVnq-jlSripR-ncVRs1pmfxKpYZTf-aBTbzedt-uTcqSj271KV36q33uumPLj63fN76W2_xEWUBOn6ZhWpNDAhFX3QlLIiiAMPEcEVBhrKsuEM7ehOUigpYQhCyXakYhVwg1AlDYDhDaY0ZGFFLr1Pc677WZ-GSp-69rHsfmlbtnrZ3ittu696GDRmBBM64sG_8W_9_onHYuTfz7x1faudafva7I09HmvTa4wZCCnxSH2cqX15-CMyUamedggYAynIDxjZDzN76uz3oXa9fmydqQ-H8ljbwWngkmDOGcb_gXIiSBjKKRXPqOmsc13dvHwDkJ7uQk-166l2Pd6FBp1O0vUstfakH-zQHcem_ib8Bgz5rYY</recordid><startdate>20150501</startdate><enddate>20150501</enddate><creator>Chasapis, A.</creator><creator>Retinò, A.</creator><creator>Sahraoui, F.</creator><creator>Vaivads, A.</creator><creator>Khotyaintsev, Yu. 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Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Chasapis, A.</au><au>Retinò, A.</au><au>Sahraoui, F.</au><au>Vaivads, A.</au><au>Khotyaintsev, Yu. V.</au><au>Sundkvist, D.</au><au>Greco, A.</au><au>Sorriso-Valvo, L.</au><au>Canu, P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THIN CURRENT SHEETS AND ASSOCIATED ELECTRON HEATING IN TURBULENT SPACE PLASMA</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2015-05-01</date><risdate>2015</risdate><volume>804</volume><issue>1</issue><spage>1</spage><epage>5</epage><pages>1-5</pages><issn>2041-8205</issn><issn>2041-8213</issn><eissn>2041-8213</eissn><abstract>ABSTRACT Intermittent structures, such as thin current sheets, are abundant in turbulent plasmas. Numerical simulations indicate that such current sheets are important sites of energy dissipation and particle heating occurring at kinetic scales. However, direct evidence of dissipation and associated heating within current sheets is scarce. Here, we show a new statistical study of local electron heating within proton-scale current sheets by using high-resolution spacecraft data. Current sheets are detected using the Partial Variance of Increments (PVI) method which identifies regions of strong intermittency. We find that strong electron heating occurs in high PVI (>3) current sheets while no significant heating occurs in low PVI cases (<3), indicating that the former are dominant for energy dissipation. Current sheets corresponding to very high PVI (>5) show the strongest heating and most of the time are consistent with ongoing magnetic reconnection. 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| subjects | ACCELERATION acceleration of particles Astrophysics ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Computational fluid dynamics COMPUTERIZED SIMULATION COSMIC ELECTRONS COSMIC PROTONS Current sheets Dissipation Energy dissipation ENERGY LOSSES HEATING MAGNETIC FIELDS MAGNETIC RECONNECTION Physics PLASMA Plasma Physics Plasmas RESOLUTION SHEETS SPACE SPACE VEHICLES Spacecraft TURBULENCE |
| title | THIN CURRENT SHEETS AND ASSOCIATED ELECTRON HEATING IN TURBULENT SPACE PLASMA |
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