Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix.
Saved in:
| Title: | Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix. |
|---|---|
| Authors: | Renkwitz, T.1 renkwitz@iap-kborn.de, Singer, W.1, Latteck, R.1, Rapp, M.1 |
| Source: | Advances in Radio Science. 2011, Vol. 9, p349-357. 9p. |
| Subjects: | Radio noise, Electronic noise, Atmospheric physics, Geophysics, Cosmic noise |
| Abstract: | The Leibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn started to install a new MST radar on the North-Norwegian island Andøya (69.30° N, 16.04° E) in 2009. The new Middle Atmosphere Alomar Radar System (MAARSY) replaces the previous ALWIN radar which has been successfully operated for more than 10 years. The MAARSY radar provides increased temporal and spatial resolution combined with a flexible sequential point-to-point steering of the radar beam. To increase the spatiotemporal resolution of the observations a 16-port Butler matrix has been built and implemented to the radar. In conjunction with 64 Yagi antennas of the former ALWIN antenna array the Butler matrix simultaneously provides 16 individual beams. The beam forming capability of the Butler matrix arrangement has been verified observing the galactic cosmic radio noise of the supernova remnant Cassiopeia A. Furthermore, this multi beam configuration has been used in passive experiments to estimate the cosmic noise absorption at 53.5MHz during events of enhanced solar and geomagnetic activity as indicators for enhanced ionization at altitudes below 90 km. These observations are well correlated with simultaneous observations of corresponding beams of the co-located imaging riometer AIRIS (69.14° N, 16.02° E) at 38.2 MHz. In addition, enhanced cosmic noise absorption goes along with enhanced electron densities at altitudes below about 90 km as observed with the co-located Saura MF radar using differential absorption and differential phase measurements. [ABSTRACT FROM AUTHOR] |
| Copyright of Advances in Radio Science is the property of Copernicus Gesellschaft mbH 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 | Links: – Type: pdflink Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 74118049 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Renkwitz%2C+T%2E%22">Renkwitz, T.</searchLink><relatesTo>1</relatesTo><i> renkwitz@iap-kborn.de</i><br /><searchLink fieldCode="AR" term="%22Singer%2C+W%2E%22">Singer, W.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Latteck%2C+R%2E%22">Latteck, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rapp%2C+M%2E%22">Rapp, M.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Advances+in+Radio+Science%22">Advances in Radio Science</searchLink>. 2011, Vol. 9, p349-357. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Radio+noise%22">Radio noise</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+noise%22">Electronic noise</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+physics%22">Atmospheric physics</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysics%22">Geophysics</searchLink><br /><searchLink fieldCode="DE" term="%22Cosmic+noise%22">Cosmic noise</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Leibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn started to install a new MST radar on the North-Norwegian island Andøya (69.30° N, 16.04° E) in 2009. The new Middle Atmosphere Alomar Radar System (MAARSY) replaces the previous ALWIN radar which has been successfully operated for more than 10 years. The MAARSY radar provides increased temporal and spatial resolution combined with a flexible sequential point-to-point steering of the radar beam. To increase the spatiotemporal resolution of the observations a 16-port Butler matrix has been built and implemented to the radar. In conjunction with 64 Yagi antennas of the former ALWIN antenna array the Butler matrix simultaneously provides 16 individual beams. The beam forming capability of the Butler matrix arrangement has been verified observing the galactic cosmic radio noise of the supernova remnant Cassiopeia A. Furthermore, this multi beam configuration has been used in passive experiments to estimate the cosmic noise absorption at 53.5MHz during events of enhanced solar and geomagnetic activity as indicators for enhanced ionization at altitudes below 90 km. These observations are well correlated with simultaneous observations of corresponding beams of the co-located imaging riometer AIRIS (69.14° N, 16.02° E) at 38.2 MHz. In addition, enhanced cosmic noise absorption goes along with enhanced electron densities at altitudes below about 90 km as observed with the co-located Saura MF radar using differential absorption and differential phase measurements. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Advances in Radio Science is the property of Copernicus Gesellschaft mbH 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.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=74118049 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.5194/ars-9-349-2011 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 349 Subjects: – SubjectFull: Radio noise Type: general – SubjectFull: Electronic noise Type: general – SubjectFull: Atmospheric physics Type: general – SubjectFull: Geophysics Type: general – SubjectFull: Cosmic noise Type: general Titles: – TitleFull: Multi beam observations of cosmic radio noise using a VHF radar with beam forming by a Butler matrix. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Renkwitz, T. – PersonEntity: Name: NameFull: Singer, W. – PersonEntity: Name: NameFull: Latteck, R. – PersonEntity: Name: NameFull: Rapp, M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2011 Type: published Y: 2011 Identifiers: – Type: issn-print Value: 16849965 Numbering: – Type: volume Value: 9 Titles: – TitleFull: Advances in Radio Science Type: main |
| ResultId | 1 |
