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Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India
Observations of equatorial electrojet (EEJ) plasma irregularities made using a newly established 18 MHz coherent backscatter radar at Trivandrum are presented. Also presented are the simultaneous observations of the electrojet plasma irregularities made using a collocated 54.95 MHz radar. These corr...
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Published in: | Journal of Geophysical Research. A. Space Physics 2003-10, Vol.108 (A10), p.SIA3.1-n/a |
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description | Observations of equatorial electrojet (EEJ) plasma irregularities made using a newly established 18 MHz coherent backscatter radar at Trivandrum are presented. Also presented are the simultaneous observations of the electrojet plasma irregularities made using a collocated 54.95 MHz radar. These correspond to 8.3 m and 2.7 m scale irregularities, respectively. The statistics of spectral parameters observed at the two scale sizes are also presented and compared in detail. An interesting and new aspect of these observations is that the 8.3 m irregularities have significant anisotropy in the plane perpendicular to magnetic field in contrast to that reported for 3 m irregularities. While type‐1 and type‐2 spectra could be distinctly observed at 2.7 m, it is rather difficult to distinguish at 8.3 m. The type‐2 velocities for the two scale sizes are pretty close to each other below 102 km, but the velocities for 8.3 m are less than that of 2.7 m above. Type‐1 velocities are quite close to each other only at altitudes of the peak electrojet when clear type‐1 echoes are observed. Spectral widths are remarkably different at the two scale sizes. The ratio of spectral width corresponding to 2.7 m to that at 8.3 m is close to 1.4, quite similar to that reported earlier from Jicamarca. The observed difference in the velocities and spectral width at the two scale sizes are attributed to the effects of anomalous collision of electrons caused by the large‐scale turbulence present in the EEJ. The above observations are found to be consistent with the EEJ instability theories and related simulation works. |
doi_str_mv | 10.1029/2002JA009698 |
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K. ; Viswanathan, K. S. ; Jyoti, N. ; Devasia, C. V. ; Subbarao, K. S. V. ; Sridharan, R.</creator><creatorcontrib>Tiwari, Diwakar ; Patra, A. K. ; Viswanathan, K. S. ; Jyoti, N. ; Devasia, C. V. ; Subbarao, K. S. V. ; Sridharan, R.</creatorcontrib><description>Observations of equatorial electrojet (EEJ) plasma irregularities made using a newly established 18 MHz coherent backscatter radar at Trivandrum are presented. Also presented are the simultaneous observations of the electrojet plasma irregularities made using a collocated 54.95 MHz radar. These correspond to 8.3 m and 2.7 m scale irregularities, respectively. The statistics of spectral parameters observed at the two scale sizes are also presented and compared in detail. An interesting and new aspect of these observations is that the 8.3 m irregularities have significant anisotropy in the plane perpendicular to magnetic field in contrast to that reported for 3 m irregularities. While type‐1 and type‐2 spectra could be distinctly observed at 2.7 m, it is rather difficult to distinguish at 8.3 m. The type‐2 velocities for the two scale sizes are pretty close to each other below 102 km, but the velocities for 8.3 m are less than that of 2.7 m above. Type‐1 velocities are quite close to each other only at altitudes of the peak electrojet when clear type‐1 echoes are observed. Spectral widths are remarkably different at the two scale sizes. The ratio of spectral width corresponding to 2.7 m to that at 8.3 m is close to 1.4, quite similar to that reported earlier from Jicamarca. The observed difference in the velocities and spectral width at the two scale sizes are attributed to the effects of anomalous collision of electrons caused by the large‐scale turbulence present in the EEJ. The above observations are found to be consistent with the EEJ instability theories and related simulation works.</description><identifier>ISSN: 0148-0227</identifier><identifier>EISSN: 2156-2202</identifier><identifier>DOI: 10.1029/2002JA009698</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>anisotropy ; Earth, ocean, space ; equatorial electrojet irregularities ; Exact sciences and technology ; External geophysics ; ionospheric irregularities ; Physics of the ionosphere ; Physics of the magnetosphere ; plasma instabilities ; type-1 and type-2 spectra</subject><ispartof>Journal of Geophysical Research. A. 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K.</creatorcontrib><creatorcontrib>Viswanathan, K. S.</creatorcontrib><creatorcontrib>Jyoti, N.</creatorcontrib><creatorcontrib>Devasia, C. V.</creatorcontrib><creatorcontrib>Subbarao, K. S. V.</creatorcontrib><creatorcontrib>Sridharan, R.</creatorcontrib><title>Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India</title><title>Journal of Geophysical Research. A. Space Physics</title><addtitle>J. Geophys. Res</addtitle><description>Observations of equatorial electrojet (EEJ) plasma irregularities made using a newly established 18 MHz coherent backscatter radar at Trivandrum are presented. Also presented are the simultaneous observations of the electrojet plasma irregularities made using a collocated 54.95 MHz radar. These correspond to 8.3 m and 2.7 m scale irregularities, respectively. The statistics of spectral parameters observed at the two scale sizes are also presented and compared in detail. An interesting and new aspect of these observations is that the 8.3 m irregularities have significant anisotropy in the plane perpendicular to magnetic field in contrast to that reported for 3 m irregularities. While type‐1 and type‐2 spectra could be distinctly observed at 2.7 m, it is rather difficult to distinguish at 8.3 m. The type‐2 velocities for the two scale sizes are pretty close to each other below 102 km, but the velocities for 8.3 m are less than that of 2.7 m above. Type‐1 velocities are quite close to each other only at altitudes of the peak electrojet when clear type‐1 echoes are observed. Spectral widths are remarkably different at the two scale sizes. The ratio of spectral width corresponding to 2.7 m to that at 8.3 m is close to 1.4, quite similar to that reported earlier from Jicamarca. The observed difference in the velocities and spectral width at the two scale sizes are attributed to the effects of anomalous collision of electrons caused by the large‐scale turbulence present in the EEJ. The above observations are found to be consistent with the EEJ instability theories and related simulation works.</description><subject>anisotropy</subject><subject>Earth, ocean, space</subject><subject>equatorial electrojet irregularities</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>ionospheric irregularities</subject><subject>Physics of the ionosphere</subject><subject>Physics of the magnetosphere</subject><subject>plasma instabilities</subject><subject>type-1 and type-2 spectra</subject><issn>0148-0227</issn><issn>2156-2202</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNqFkU9v1DAQxS0EEqvSGx_AFzg1xXZsJz4uFWxblT9aFnG0JskYXJxksZ2F8unJKhVwgrmMNPq9p3l6hDzl7JwzYV4IxsT1mjGjTf2ArARXuhCCiYdkxbisCyZE9ZicpnTL5pFKS8ZXJH7w_RQyDDhOiUboINKxSRgPkP04JDo6mr8gxYBtjuMtZroPkHqgPkb8PAWIPntMFDLlNYWho0qeG0XfXP6k4wEj3UV_mM9x6s_o1dB5eEIeOQgJT-_3Cfn4-tXu4rK4ebe5uljfFK2slCpkWSrWuJbXnWagXYPOSNZoaFzZcdCyNRKqBrqOO94g05VBqJUDxV0tdVeekOeL7z6O3yZM2fY-tRjCEtaKyuiqrNV_QW4Ek7o8gmcL2MYxpYjO7qPvId5ZzuyxBPt3CTP-7N4XUgvBRRhan_5o1GzJjJm5cuG--4B3__S015vtmutaHp8pFpVPGX_8VkH8audYlbKf3m7srtq-3_KX2u7KX4eFpI4</recordid><startdate>200310</startdate><enddate>200310</enddate><creator>Tiwari, Diwakar</creator><creator>Patra, A. K.</creator><creator>Viswanathan, K. S.</creator><creator>Jyoti, N.</creator><creator>Devasia, C. V.</creator><creator>Subbarao, K. S. V.</creator><creator>Sridharan, 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>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>200310</creationdate><title>Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India</title><author>Tiwari, Diwakar ; Patra, A. K. ; Viswanathan, K. S. ; Jyoti, N. ; Devasia, C. V. ; Subbarao, K. S. 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V.</creatorcontrib><creatorcontrib>Subbarao, K. S. V.</creatorcontrib><creatorcontrib>Sridharan, R.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical 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>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of Geophysical Research. A. Space Physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tiwari, Diwakar</au><au>Patra, A. K.</au><au>Viswanathan, K. S.</au><au>Jyoti, N.</au><au>Devasia, C. V.</au><au>Subbarao, K. S. V.</au><au>Sridharan, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India</atitle><jtitle>Journal of Geophysical Research. A. Space Physics</jtitle><addtitle>J. Geophys. Res</addtitle><date>2003-10</date><risdate>2003</risdate><volume>108</volume><issue>A10</issue><spage>SIA3.1</spage><epage>n/a</epage><pages>SIA3.1-n/a</pages><issn>0148-0227</issn><eissn>2156-2202</eissn><abstract>Observations of equatorial electrojet (EEJ) plasma irregularities made using a newly established 18 MHz coherent backscatter radar at Trivandrum are presented. Also presented are the simultaneous observations of the electrojet plasma irregularities made using a collocated 54.95 MHz radar. These correspond to 8.3 m and 2.7 m scale irregularities, respectively. The statistics of spectral parameters observed at the two scale sizes are also presented and compared in detail. An interesting and new aspect of these observations is that the 8.3 m irregularities have significant anisotropy in the plane perpendicular to magnetic field in contrast to that reported for 3 m irregularities. While type‐1 and type‐2 spectra could be distinctly observed at 2.7 m, it is rather difficult to distinguish at 8.3 m. The type‐2 velocities for the two scale sizes are pretty close to each other below 102 km, but the velocities for 8.3 m are less than that of 2.7 m above. Type‐1 velocities are quite close to each other only at altitudes of the peak electrojet when clear type‐1 echoes are observed. Spectral widths are remarkably different at the two scale sizes. The ratio of spectral width corresponding to 2.7 m to that at 8.3 m is close to 1.4, quite similar to that reported earlier from Jicamarca. The observed difference in the velocities and spectral width at the two scale sizes are attributed to the effects of anomalous collision of electrons caused by the large‐scale turbulence present in the EEJ. The above observations are found to be consistent with the EEJ instability theories and related simulation works.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2002JA009698</doi><tpages>13</tpages></addata></record> |
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subjects | anisotropy Earth, ocean, space equatorial electrojet irregularities Exact sciences and technology External geophysics ionospheric irregularities Physics of the ionosphere Physics of the magnetosphere plasma instabilities type-1 and type-2 spectra |
title | Simultaneous radar observations of the electrojet plasma irregularities at 18 and 54.95 MHz over Trivandrum, India |
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