The possible role of ionospheric oxygen in the initiation and development of plasma sheet instabilities
We relate measurements made during substorm growth and expansion to available plasma compositional observations and propose that asymmetries in the distribution of enhanced densities of O+ (of ionospheric origin) may define regions of the plasma sheet in which tearing mode growth rates are increased...
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| Veröffentlicht in: | Geophys. Res. Lett.; (United States) 1982-12, Vol.9 (12), p.1337-1340 |
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| container_title | Geophys. Res. Lett.; (United States) |
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| creator | Baker, D. N. Hones, E. W. Young, D. T. Birn, J. |
| description | We relate measurements made during substorm growth and expansion to available plasma compositional observations and propose that asymmetries in the distribution of enhanced densities of O+ (of ionospheric origin) may define regions of the plasma sheet in which tearing mode growth rates are increased and the instability threshold is lowered. We make qualitative estimates of the growth rates of the linear ion tearing mode using statistical models of the dusk‐dawn and earthward‐tailward distributions of O+. The theoretical results predict maximum ion tearing growth rate in the range XGSM = −10 to −15 RE and YGSM ∼ 5 RE. These values are in reasonable accord with substorm observations since many asymmetries in particle and field phenomena associated with substorms favor the interpretation that substorm onset occurs in the dusk sector of the near‐earth plasma sheet. Present results therefore suggest that substorm initiation and development may be closely related to distribution patterns of ionospheric ions. |
| doi_str_mv | 10.1029/GL009i012p01337 |
| format | Article |
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N. ; Hones, E. W. ; Young, D. T. ; Birn, J.</creator><creatorcontrib>Baker, D. N. ; Hones, E. W. ; Young, D. T. ; Birn, J. ; Los Alamos National Laboratory, Los Alamos, New Mexico 87545</creatorcontrib><description>We relate measurements made during substorm growth and expansion to available plasma compositional observations and propose that asymmetries in the distribution of enhanced densities of O+ (of ionospheric origin) may define regions of the plasma sheet in which tearing mode growth rates are increased and the instability threshold is lowered. We make qualitative estimates of the growth rates of the linear ion tearing mode using statistical models of the dusk‐dawn and earthward‐tailward distributions of O+. The theoretical results predict maximum ion tearing growth rate in the range XGSM = −10 to −15 RE and YGSM ∼ 5 RE. These values are in reasonable accord with substorm observations since many asymmetries in particle and field phenomena associated with substorms favor the interpretation that substorm onset occurs in the dusk sector of the near‐earth plasma sheet. Present results therefore suggest that substorm initiation and development may be closely related to distribution patterns of ionospheric ions.</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1029/GL009i012p01337</identifier><language>eng</language><publisher>United States: Blackwell Publishing Ltd</publisher><subject>CHARGED PARTICLES ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; Density ; EARTH ATMOSPHERE ; INSTABILITY ; INSTABILITY GROWTH RATES ; ION DENSITY ; Ionospherics ; IONS ; MAGNETIC BAYS ; MAGNETOSPHERE ; Mathematical models ; Origins ; OXYGEN IONS ; PLASMA INSTABILITY ; PLASMA MACROINSTABILITIES 640203 -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987) ; PLASMA SHEET ; Skewed distributions ; Stability ; Tearing ; TEARING INSTABILITY</subject><ispartof>Geophys. Res. 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N.</creatorcontrib><creatorcontrib>Hones, E. W.</creatorcontrib><creatorcontrib>Young, D. T.</creatorcontrib><creatorcontrib>Birn, J.</creatorcontrib><creatorcontrib>Los Alamos National Laboratory, Los Alamos, New Mexico 87545</creatorcontrib><title>The possible role of ionospheric oxygen in the initiation and development of plasma sheet instabilities</title><title>Geophys. Res. Lett.; (United States)</title><addtitle>Geophys. Res. Lett</addtitle><description>We relate measurements made during substorm growth and expansion to available plasma compositional observations and propose that asymmetries in the distribution of enhanced densities of O+ (of ionospheric origin) may define regions of the plasma sheet in which tearing mode growth rates are increased and the instability threshold is lowered. We make qualitative estimates of the growth rates of the linear ion tearing mode using statistical models of the dusk‐dawn and earthward‐tailward distributions of O+. The theoretical results predict maximum ion tearing growth rate in the range XGSM = −10 to −15 RE and YGSM ∼ 5 RE. These values are in reasonable accord with substorm observations since many asymmetries in particle and field phenomena associated with substorms favor the interpretation that substorm onset occurs in the dusk sector of the near‐earth plasma sheet. Present results therefore suggest that substorm initiation and development may be closely related to distribution patterns of ionospheric ions.</description><subject>CHARGED PARTICLES</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>Density</subject><subject>EARTH ATMOSPHERE</subject><subject>INSTABILITY</subject><subject>INSTABILITY GROWTH RATES</subject><subject>ION DENSITY</subject><subject>Ionospherics</subject><subject>IONS</subject><subject>MAGNETIC BAYS</subject><subject>MAGNETOSPHERE</subject><subject>Mathematical models</subject><subject>Origins</subject><subject>OXYGEN IONS</subject><subject>PLASMA INSTABILITY</subject><subject>PLASMA MACROINSTABILITIES 640203 -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)</subject><subject>PLASMA SHEET</subject><subject>Skewed distributions</subject><subject>Stability</subject><subject>Tearing</subject><subject>TEARING INSTABILITY</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1982</creationdate><recordtype>article</recordtype><recordid>eNqFkU1vFDEMQCMEEkvhzDXigLgMdT5mkhxRRQfULUjVIrhFmay3G5hNhkkK3X9PVoM4cICLbcnvWbJNyHMGrxlwc96vAUwAxidgQqgHZMWMlI0GUA_JqvZqzVX3mDzJ-SsACBBsRW43e6RTyjkMI9I51ZB2NKSY8rTHOXia7o-3GGmItFQ0xFCCKxWgLm7pFn_gmKYDxnLyptHlg6N5j1gqmosbwlgFzE_Jo50bMz77nc_Ip8u3m4t3zfpj__7izbrxUhneMAOtV84MZhBeM7b1g9JKd6rVUg6tQ9SiFYP2wm-d4JzJDmSna2YCsBPijLxY5qZcgs0-FPR7n2JEX2ynDNNGV-jlAk1z-n6HudhDyB7H0UVMd9lyAa1hvKvgq3-CrOXGSN2JE3q-oH6u15xxZ6c5HNx8tAzs6UH2rwdVQy7GzzDi8X-47W_WnCletWbRQi54_0dz87e6n1Ct_fyht9dic_Wl72-sFL8AcVOhrg</recordid><startdate>198212</startdate><enddate>198212</enddate><creator>Baker, D. 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T. ; Birn, J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4792-1905c7a9b9b3c811dcb7878675844b5aee8353b8c3cda3221460468214130e633</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1982</creationdate><topic>CHARGED PARTICLES</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>Density</topic><topic>EARTH ATMOSPHERE</topic><topic>INSTABILITY</topic><topic>INSTABILITY GROWTH RATES</topic><topic>ION DENSITY</topic><topic>Ionospherics</topic><topic>IONS</topic><topic>MAGNETIC BAYS</topic><topic>MAGNETOSPHERE</topic><topic>Mathematical models</topic><topic>Origins</topic><topic>OXYGEN IONS</topic><topic>PLASMA INSTABILITY</topic><topic>PLASMA MACROINSTABILITIES 640203 -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)</topic><topic>PLASMA SHEET</topic><topic>Skewed distributions</topic><topic>Stability</topic><topic>Tearing</topic><topic>TEARING INSTABILITY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Baker, D. N.</creatorcontrib><creatorcontrib>Hones, E. W.</creatorcontrib><creatorcontrib>Young, D. T.</creatorcontrib><creatorcontrib>Birn, J.</creatorcontrib><creatorcontrib>Los Alamos National Laboratory, Los Alamos, New Mexico 87545</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Geophys. Res. Lett.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Baker, D. N.</au><au>Hones, E. W.</au><au>Young, D. T.</au><au>Birn, J.</au><aucorp>Los Alamos National Laboratory, Los Alamos, New Mexico 87545</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The possible role of ionospheric oxygen in the initiation and development of plasma sheet instabilities</atitle><jtitle>Geophys. Res. Lett.; (United States)</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>1982-12</date><risdate>1982</risdate><volume>9</volume><issue>12</issue><spage>1337</spage><epage>1340</epage><pages>1337-1340</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>We relate measurements made during substorm growth and expansion to available plasma compositional observations and propose that asymmetries in the distribution of enhanced densities of O+ (of ionospheric origin) may define regions of the plasma sheet in which tearing mode growth rates are increased and the instability threshold is lowered. We make qualitative estimates of the growth rates of the linear ion tearing mode using statistical models of the dusk‐dawn and earthward‐tailward distributions of O+. The theoretical results predict maximum ion tearing growth rate in the range XGSM = −10 to −15 RE and YGSM ∼ 5 RE. These values are in reasonable accord with substorm observations since many asymmetries in particle and field phenomena associated with substorms favor the interpretation that substorm onset occurs in the dusk sector of the near‐earth plasma sheet. Present results therefore suggest that substorm initiation and development may be closely related to distribution patterns of ionospheric ions.</abstract><cop>United States</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/GL009i012p01337</doi><tpages>4</tpages></addata></record> |
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| identifier | ISSN: 0094-8276 |
| ispartof | Geophys. Res. Lett.; (United States), 1982-12, Vol.9 (12), p.1337-1340 |
| issn | 0094-8276 1944-8007 |
| language | eng |
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| source | Wiley Online Library All Journals |
| subjects | CHARGED PARTICLES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Density EARTH ATMOSPHERE INSTABILITY INSTABILITY GROWTH RATES ION DENSITY Ionospherics IONS MAGNETIC BAYS MAGNETOSPHERE Mathematical models Origins OXYGEN IONS PLASMA INSTABILITY PLASMA MACROINSTABILITIES 640203 -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987) PLASMA SHEET Skewed distributions Stability Tearing TEARING INSTABILITY |
| title | The possible role of ionospheric oxygen in the initiation and development of plasma sheet instabilities |
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