The day-to-day variability in the mesosphere and lower thermosphere in low latitudes: A study using MF radar.
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| Title: | The day-to-day variability in the mesosphere and lower thermosphere in low latitudes: A study using MF radar. |
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| Authors: | Gaikwad, H.P.1,2 (AUTHOR) herambgaikwad01@gmail.com, Fadnavis, S.3 (AUTHOR) suvarna@tropmet.res.in, Gurav, O.B.4 (AUTHOR) omgurav91@gmail.com, Bhosale, J.L.1 (AUTHOR) bhosalejl@gmail.com, Sharma, A.K.1,5 (AUTHOR) ashok.kumar@smvdu.ac.in, Patil, P.T.6 (AUTHOR) ptpiigkop@yahoo.com, Ghodpage, R.N.6 (AUTHOR) rupeshghodpage@gmail.com, Sutar, M.M.1 (AUTHOR) smilind20066@gmail.com, Chavan, G.A.7 (AUTHOR) gangadharchavan2@gmail.com, Birajdar, A.T.1 (AUTHOR) appu.birajdar12@gmail.com, Shetti, D.J.8 (AUTHOR) jitushetti@gmail.com |
| Source: | Advances in Space Research. Jan2023, Vol. 71 Issue 1, p199-215. 17p. |
| Subjects: | Mesosphere, Rossby waves, Radar, Thermosphere, Latitude, Madden-Julian oscillation |
| Abstract: | This study presents the analysis of planetary waves (PWs) using daily mean wind velocities for four years (August 2013 to July 2017) of continuous measurements using MF radar over the low latitude Indian region Kolhapur (16.8° N; 74.2° E). The MF radar at Kolhapur was upgraded in 2013. These are the first results of PWs after the upgradation of MF radar. The seasonal and intra-seasonal variabilities of East-West (EW) traveling PWs in the MLT region have been studied. In the present work, the data was analyzed to study the waves with various periodicities (e.g. 3–4, 5–8, 15–17, and 30–60 days). The 3.5 day [Ultra-Fast Kelvin (UFK)] wave shows semiannual variability with burst like wave activity observed during the summer months and December solstice. In addition, it is observed to be stronger in the spring equinoctial period. A strong semiannual oscillation (SAO) has been observed in a 6.5-day wave with peaks near the equinoxes. Similar to SAO over the low latitude MLT region, the wave activity is stronger in April/May than in September/October. The 6.5-day waves are observed to be stronger when the background mean wind is westward. From the analysis, it has been seen that the period before and after the equinoctial period is favorable for the 6.5-day wave propagation. The 16-day wave has no significant seasonal dependence; instead, the waves spread to almost all seasons. The Madden-Julian Oscillations (MJOs) have been observed to be propagating with an average wind speed of ∼ 5 m/s when the background mean wind is eastward. The occurrence of MJO is observed during the summer and winter months. These results are the first of their kind in two aspects: first, they show the PWs with enhanced altitude coverage covering up to 110 km, and second, they show the PWs not contaminated due to equatorial electro jet influence. [ABSTRACT FROM AUTHOR] |
| Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 160845589 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The day-to-day variability in the mesosphere and lower thermosphere in low latitudes: A study using MF radar. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gaikwad%2C+H%2EP%2E%22">Gaikwad, H.P.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> herambgaikwad01@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Fadnavis%2C+S%2E%22">Fadnavis, S.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> suvarna@tropmet.res.in</i><br /><searchLink fieldCode="AR" term="%22Gurav%2C+O%2EB%2E%22">Gurav, O.B.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> omgurav91@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Bhosale%2C+J%2EL%2E%22">Bhosale, J.L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bhosalejl@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Sharma%2C+A%2EK%2E%22">Sharma, A.K.</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<i> ashok.kumar@smvdu.ac.in</i><br /><searchLink fieldCode="AR" term="%22Patil%2C+P%2ET%2E%22">Patil, P.T.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<i> ptpiigkop@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Ghodpage%2C+R%2EN%2E%22">Ghodpage, R.N.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<i> rupeshghodpage@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Sutar%2C+M%2EM%2E%22">Sutar, M.M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> smilind20066@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Chavan%2C+G%2EA%2E%22">Chavan, G.A.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<i> gangadharchavan2@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Birajdar%2C+A%2ET%2E%22">Birajdar, A.T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> appu.birajdar12@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Shetti%2C+D%2EJ%2E%22">Shetti, D.J.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<i> jitushetti@gmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Advances+in+Space+Research%22">Advances in Space Research</searchLink>. Jan2023, Vol. 71 Issue 1, p199-215. 17p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Mesosphere%22">Mesosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Rossby+waves%22">Rossby waves</searchLink><br /><searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink><br /><searchLink fieldCode="DE" term="%22Thermosphere%22">Thermosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Latitude%22">Latitude</searchLink><br /><searchLink fieldCode="DE" term="%22Madden-Julian+oscillation%22">Madden-Julian oscillation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study presents the analysis of planetary waves (PWs) using daily mean wind velocities for four years (August 2013 to July 2017) of continuous measurements using MF radar over the low latitude Indian region Kolhapur (16.8° N; 74.2° E). The MF radar at Kolhapur was upgraded in 2013. These are the first results of PWs after the upgradation of MF radar. The seasonal and intra-seasonal variabilities of East-West (EW) traveling PWs in the MLT region have been studied. In the present work, the data was analyzed to study the waves with various periodicities (e.g. 3–4, 5–8, 15–17, and 30–60 days). The 3.5 day [Ultra-Fast Kelvin (UFK)] wave shows semiannual variability with burst like wave activity observed during the summer months and December solstice. In addition, it is observed to be stronger in the spring equinoctial period. A strong semiannual oscillation (SAO) has been observed in a 6.5-day wave with peaks near the equinoxes. Similar to SAO over the low latitude MLT region, the wave activity is stronger in April/May than in September/October. The 6.5-day waves are observed to be stronger when the background mean wind is westward. From the analysis, it has been seen that the period before and after the equinoctial period is favorable for the 6.5-day wave propagation. The 16-day wave has no significant seasonal dependence; instead, the waves spread to almost all seasons. The Madden-Julian Oscillations (MJOs) have been observed to be propagating with an average wind speed of ∼ 5 m/s when the background mean wind is eastward. The occurrence of MJO is observed during the summer and winter months. These results are the first of their kind in two aspects: first, they show the PWs with enhanced altitude coverage covering up to 110 km, and second, they show the PWs not contaminated due to equatorial electro jet influence. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Advances in Space Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.asr.2022.08.066 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 199 Subjects: – SubjectFull: Mesosphere Type: general – SubjectFull: Rossby waves Type: general – SubjectFull: Radar Type: general – SubjectFull: Thermosphere Type: general – SubjectFull: Latitude Type: general – SubjectFull: Madden-Julian oscillation Type: general Titles: – TitleFull: The day-to-day variability in the mesosphere and lower thermosphere in low latitudes: A study using MF radar. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gaikwad, H.P. – PersonEntity: Name: NameFull: Fadnavis, S. – PersonEntity: Name: NameFull: Gurav, O.B. – PersonEntity: Name: NameFull: Bhosale, J.L. – PersonEntity: Name: NameFull: Sharma, A.K. – PersonEntity: Name: NameFull: Patil, P.T. – PersonEntity: Name: NameFull: Ghodpage, R.N. – PersonEntity: Name: NameFull: Sutar, M.M. – PersonEntity: Name: NameFull: Chavan, G.A. – PersonEntity: Name: NameFull: Birajdar, A.T. – PersonEntity: Name: NameFull: Shetti, D.J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 02731177 Numbering: – Type: volume Value: 71 – Type: issue Value: 1 Titles: – TitleFull: Advances in Space Research Type: main |
| ResultId | 1 |
