Interferometric determination of broadband ELF wave phase velocity within a region of transverse auroral ion acceleration
Broadband electric field fluctuations with typical amplitudes of 10–20 mV/m peak‐to‐peak and frequencies from 0 Hz to 3 kHz (BB‐ELF) were observed coincident with a region of ≤200 eV transverse H+ acceleration (TAI) near the poleward edge of the pre‐midnight aurora. The coherence and phase velocity...
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| Veröffentlicht in: | Geophysical research letters 1996-11, Vol.23 (23), p.3297-3300 |
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| container_end_page | 3300 |
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| container_issue | 23 |
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| container_title | Geophysical research letters |
| container_volume | 23 |
| creator | Bonnell, J. Kintner, P. Wahlund, J.-E. Lynch, K. Arnoldy, R. |
| description | Broadband electric field fluctuations with typical amplitudes of 10–20 mV/m peak‐to‐peak and frequencies from 0 Hz to 3 kHz (BB‐ELF) were observed coincident with a region of ≤200 eV transverse H+ acceleration (TAI) near the poleward edge of the pre‐midnight aurora. The coherence and phase velocity of the electric fields were measured using a interferometric antenna array over the frequency range of ≈ 100 Hz to 3 kHz. These electric field fluctuations were found to have the following characteristics: 1) incoherence perpendicular to the geomagnetic field, 2) coherence parallel to the the geomagnetic field, 3) parallel phase velocity (ω/k∥) of 30–35 km/s upwards, 4) 0 < |k∥/k⟂| < 0.22. We show that these properties are compatible with the emission being electrostatic H+ cyclotron (EHC) waves. We also discuss possible generation mechanisms for the waves, and their relationship to the TAI. |
| doi_str_mv | 10.1029/96GL03238 |
| format | Article |
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The coherence and phase velocity of the electric fields were measured using a interferometric antenna array over the frequency range of ≈ 100 Hz to 3 kHz. These electric field fluctuations were found to have the following characteristics: 1) incoherence perpendicular to the geomagnetic field, 2) coherence parallel to the the geomagnetic field, 3) parallel phase velocity (ω/k∥) of 30–35 km/s upwards, 4) 0 < |k∥/k⟂| < 0.22. We show that these properties are compatible with the emission being electrostatic H+ cyclotron (EHC) waves. 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Res. Lett</addtitle><description>Broadband electric field fluctuations with typical amplitudes of 10–20 mV/m peak‐to‐peak and frequencies from 0 Hz to 3 kHz (BB‐ELF) were observed coincident with a region of ≤200 eV transverse H+ acceleration (TAI) near the poleward edge of the pre‐midnight aurora. The coherence and phase velocity of the electric fields were measured using a interferometric antenna array over the frequency range of ≈ 100 Hz to 3 kHz. These electric field fluctuations were found to have the following characteristics: 1) incoherence perpendicular to the geomagnetic field, 2) coherence parallel to the the geomagnetic field, 3) parallel phase velocity (ω/k∥) of 30–35 km/s upwards, 4) 0 < |k∥/k⟂| < 0.22. We show that these properties are compatible with the emission being electrostatic H+ cyclotron (EHC) waves. We also discuss possible generation mechanisms for the waves, and their relationship to the TAI.</description><subject>Acceleration</subject><subject>Broadband</subject><subject>Coherence</subject><subject>Earth, ocean, space</subject><subject>Electric fields</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Fluctuation</subject><subject>Geomagnetic fields</subject><subject>Hydrogen</subject><subject>Interactions between waves and particles</subject><subject>Interferometry</subject><subject>Phase velocity</subject><subject>Physics of the ionosphere</subject><subject>Q1</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNqFkU1vEzEQhi0EEqFw4B_4gBActvj744iqNlRapRIf4mh5vbPUsNkN9iYh_x5vE-UGPdmjeZ5XoxmEXlNySQmzH6xa1oQzbp6gBbVCVIYQ_RQtCLHlz7R6jl7k_JMQwgmnC3S4HSZIHaRxDVOKAbdQ6nUc_BTHAY8dbtLo28YPLb6ub_De7wBv7n0GvIN-DHE64H2c7uOAPU7w4yRNyQ95B6lgfpvG5Hs8d3wI0EN6yH6JnnW-z_Dq9F6gbzfXX68-VfXd8vbqY10FoSivOGslDUZJU2poTdu0JnSqEYwxGSw0vNOttjQIrlgRpOgE1V4ZHpRuguUX6O0xd5PG31vIk1vHXMbo_QDjNjtqqLCUqQK--z-oBOPz4uTjmdLocgTxeKZkglsl9Tzn-yMa0phzgs5tUlz7dHCUuPm27nzbwr45xfocfN-VbYeYzwITxlA9Y5dHbB97OPw7zy0_11YrXoTqKMQ8wZ-z4NMvpzTX0n1fLR0VtVx9odSt-F80HL_4</recordid><startdate>19961115</startdate><enddate>19961115</enddate><creator>Bonnell, J.</creator><creator>Kintner, P.</creator><creator>Wahlund, J.-E.</creator><creator>Lynch, K.</creator><creator>Arnoldy, R.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>7SC</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope></search><sort><creationdate>19961115</creationdate><title>Interferometric determination of broadband ELF wave phase velocity within a region of transverse auroral ion acceleration</title><author>Bonnell, J. ; Kintner, P. ; Wahlund, J.-E. ; Lynch, K. ; Arnoldy, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4613-32d51c8658c46ed8dbd8cf6b42225c9eb3f7d791c436261354f417a683c67bc93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>Acceleration</topic><topic>Broadband</topic><topic>Coherence</topic><topic>Earth, ocean, space</topic><topic>Electric fields</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Fluctuation</topic><topic>Geomagnetic fields</topic><topic>Hydrogen</topic><topic>Interactions between waves and particles</topic><topic>Interferometry</topic><topic>Phase velocity</topic><topic>Physics of the ionosphere</topic><topic>Q1</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bonnell, J.</creatorcontrib><creatorcontrib>Kintner, P.</creatorcontrib><creatorcontrib>Wahlund, J.-E.</creatorcontrib><creatorcontrib>Lynch, K.</creatorcontrib><creatorcontrib>Arnoldy, R.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Computer and Information Systems Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bonnell, J.</au><au>Kintner, P.</au><au>Wahlund, J.-E.</au><au>Lynch, K.</au><au>Arnoldy, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Interferometric determination of broadband ELF wave phase velocity within a region of transverse auroral ion acceleration</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>1996-11-15</date><risdate>1996</risdate><volume>23</volume><issue>23</issue><spage>3297</spage><epage>3300</epage><pages>3297-3300</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>Broadband electric field fluctuations with typical amplitudes of 10–20 mV/m peak‐to‐peak and frequencies from 0 Hz to 3 kHz (BB‐ELF) were observed coincident with a region of ≤200 eV transverse H+ acceleration (TAI) near the poleward edge of the pre‐midnight aurora. The coherence and phase velocity of the electric fields were measured using a interferometric antenna array over the frequency range of ≈ 100 Hz to 3 kHz. These electric field fluctuations were found to have the following characteristics: 1) incoherence perpendicular to the geomagnetic field, 2) coherence parallel to the the geomagnetic field, 3) parallel phase velocity (ω/k∥) of 30–35 km/s upwards, 4) 0 < |k∥/k⟂| < 0.22. We show that these properties are compatible with the emission being electrostatic H+ cyclotron (EHC) waves. We also discuss possible generation mechanisms for the waves, and their relationship to the TAI.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/96GL03238</doi><tpages>4</tpages></addata></record> |
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| identifier | ISSN: 0094-8276 |
| ispartof | Geophysical research letters, 1996-11, Vol.23 (23), p.3297-3300 |
| issn | 0094-8276 1944-8007 |
| language | eng |
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| source | Access via Wiley Online Library |
| subjects | Acceleration Broadband Coherence Earth, ocean, space Electric fields Exact sciences and technology External geophysics Fluctuation Geomagnetic fields Hydrogen Interactions between waves and particles Interferometry Phase velocity Physics of the ionosphere Q1 |
| title | Interferometric determination of broadband ELF wave phase velocity within a region of transverse auroral ion acceleration |
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