Loading…

Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions

A unique set of images of Saturn's northern polar UV aurora was obtained by the Hubble Space Telescope in 2011 and 2012 at times when the Cassini spacecraft was located in the solar wind just upstream of Saturn's bow shock. This rare situation provides an opportunity to use the Kronian par...

Full description

Saved in:
Bibliographic Details
Published in:Annales geophysicae (1988) 2014-06, Vol.32 (6), p.689-704
Main Authors: Belenkaya, E. S., Cowley, S. W. H., Meredith, C. J., Nichols, J. D., Kalegaev, V. V., Alexeev, I. I., Barinov, O. G., Barinova, W. O., Blokhina, M. S.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
cited_by cdi_FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3
cites cdi_FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3
container_end_page 704
container_issue 6
container_start_page 689
container_title Annales geophysicae (1988)
container_volume 32
creator Belenkaya, E. S.
Cowley, S. W. H.
Meredith, C. J.
Nichols, J. D.
Kalegaev, V. V.
Alexeev, I. I.
Barinov, O. G.
Barinova, W. O.
Blokhina, M. S.
description A unique set of images of Saturn's northern polar UV aurora was obtained by the Hubble Space Telescope in 2011 and 2012 at times when the Cassini spacecraft was located in the solar wind just upstream of Saturn's bow shock. This rare situation provides an opportunity to use the Kronian paraboloid magnetic field model to examine source locations of the bright auroral features by mapping them along field lines into the magnetosphere, taking account of the interplanetary magnetic field (IMF) measured near simultaneously by Cassini. It is found that the persistent dawn arc maps to closed field lines in the dawn to noon sector, with an equatorward edge generally located in the inner part of the ring current, typically at ~ 7 Saturn radii (RS) near dawn, and a poleward edge that maps variously between the centre of the ring current and beyond its outer edge at ~ 15 RS, depending on the latitudinal width of the arc. This location, together with a lack of response in properties to the concurrent IMF, suggests a principal connection with ring-current and nightside processes. The higher-latitude patchy auroras observed intermittently near to noon and at later local times extending towards dusk are instead found to straddle the model open–closed field boundary, thus mapping along field lines to the dayside outer magnetosphere and magnetopause. These emissions, which occur preferentially for northward IMF directions, are thus likely associated with reconnection and open-flux production at the magnetopause. One image for southward IMF also exhibits a prominent patch of very high latitude emissions extending poleward of patchy dawn arc emissions in the pre-noon sector. This is found to lie centrally within the region of open model field lines, suggesting an origin in the current system associated with lobe reconnection, similar to that observed in the terrestrial magnetosphere for northward IMF.
doi_str_mv 10.5194/angeo-32-689-2014
format article
fullrecord <record><control><sourceid>gale_doaj_</sourceid><recordid>TN_cdi_doaj_primary_oai_doaj_org_article_4c4fccf1541844fab9aac1bb107fbd6f</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><galeid>A481534831</galeid><doaj_id>oai_doaj_org_article_4c4fccf1541844fab9aac1bb107fbd6f</doaj_id><sourcerecordid>A481534831</sourcerecordid><originalsourceid>FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3</originalsourceid><addsrcrecordid>eNpNkc9OHSEUxieNTaq2D9AdLzAWhj8XlsZYNdG4UNfkAIcRMzPcMHMX7rrxCfqGfRKZextjSOA7H-f8Avma5iejZ5IZ8QumHnPLu1Zp03aUiS_NMRO1pnKjjj7pb83JPL9QShUz-rh5u4N-wiXP22csyZNxX1YREw6BjDngMKSpJzEXsjwjqWxGYAqr6Mj1wyN5gGVXJgK7kgsQD-MWUj_N5N-fvySN2yF5WFKuxoo4dA1kzrvikRTs16vvzdcIw4w__p-nzdPvy8eL6_b2_urm4vy29dzwpeUSFTpkASiVykSGUm4o53X36Lh3mjKvtORcdEZ5rY1yTsqgg0GOwfPT5ubADRle7LakEcqrzZDs3silt1Dq7we0wovofWRSMC1EBGcAPHOO0U10QcXKOjuweqjtaYp5KeDrCjgmnyeMqfrnQjPJheasDrDDgC95ngvGjwcwatcQ7T5EyztbQ7RriPwdAriS4w</addsrcrecordid><sourcetype>Open Website</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions</title><source>ProQuest - Publicly Available Content Database</source><creator>Belenkaya, E. S. ; Cowley, S. W. H. ; Meredith, C. J. ; Nichols, J. D. ; Kalegaev, V. V. ; Alexeev, I. I. ; Barinov, O. G. ; Barinova, W. O. ; Blokhina, M. S.</creator><creatorcontrib>Belenkaya, E. S. ; Cowley, S. W. H. ; Meredith, C. J. ; Nichols, J. D. ; Kalegaev, V. V. ; Alexeev, I. I. ; Barinov, O. G. ; Barinova, W. O. ; Blokhina, M. S.</creatorcontrib><description>A unique set of images of Saturn's northern polar UV aurora was obtained by the Hubble Space Telescope in 2011 and 2012 at times when the Cassini spacecraft was located in the solar wind just upstream of Saturn's bow shock. This rare situation provides an opportunity to use the Kronian paraboloid magnetic field model to examine source locations of the bright auroral features by mapping them along field lines into the magnetosphere, taking account of the interplanetary magnetic field (IMF) measured near simultaneously by Cassini. It is found that the persistent dawn arc maps to closed field lines in the dawn to noon sector, with an equatorward edge generally located in the inner part of the ring current, typically at ~ 7 Saturn radii (RS) near dawn, and a poleward edge that maps variously between the centre of the ring current and beyond its outer edge at ~ 15 RS, depending on the latitudinal width of the arc. This location, together with a lack of response in properties to the concurrent IMF, suggests a principal connection with ring-current and nightside processes. The higher-latitude patchy auroras observed intermittently near to noon and at later local times extending towards dusk are instead found to straddle the model open–closed field boundary, thus mapping along field lines to the dayside outer magnetosphere and magnetopause. These emissions, which occur preferentially for northward IMF directions, are thus likely associated with reconnection and open-flux production at the magnetopause. One image for southward IMF also exhibits a prominent patch of very high latitude emissions extending poleward of patchy dawn arc emissions in the pre-noon sector. This is found to lie centrally within the region of open model field lines, suggesting an origin in the current system associated with lobe reconnection, similar to that observed in the terrestrial magnetosphere for northward IMF.</description><identifier>ISSN: 1432-0576</identifier><identifier>ISSN: 0992-7689</identifier><identifier>EISSN: 1432-0576</identifier><identifier>DOI: 10.5194/angeo-32-689-2014</identifier><language>eng</language><publisher>Copernicus GmbH</publisher><subject>Analysis ; Geomagnetic fields ; Magnetosphere ; Saturn (Planet)</subject><ispartof>Annales geophysicae (1988), 2014-06, Vol.32 (6), p.689-704</ispartof><rights>COPYRIGHT 2014 Copernicus GmbH</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3</citedby><cites>FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3</cites><orcidid>0000-0002-4041-0034 ; 0000-0001-6183-4103 ; 0000-0003-2057-5365</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Belenkaya, E. S.</creatorcontrib><creatorcontrib>Cowley, S. W. H.</creatorcontrib><creatorcontrib>Meredith, C. J.</creatorcontrib><creatorcontrib>Nichols, J. D.</creatorcontrib><creatorcontrib>Kalegaev, V. V.</creatorcontrib><creatorcontrib>Alexeev, I. I.</creatorcontrib><creatorcontrib>Barinov, O. G.</creatorcontrib><creatorcontrib>Barinova, W. O.</creatorcontrib><creatorcontrib>Blokhina, M. S.</creatorcontrib><title>Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions</title><title>Annales geophysicae (1988)</title><description>A unique set of images of Saturn's northern polar UV aurora was obtained by the Hubble Space Telescope in 2011 and 2012 at times when the Cassini spacecraft was located in the solar wind just upstream of Saturn's bow shock. This rare situation provides an opportunity to use the Kronian paraboloid magnetic field model to examine source locations of the bright auroral features by mapping them along field lines into the magnetosphere, taking account of the interplanetary magnetic field (IMF) measured near simultaneously by Cassini. It is found that the persistent dawn arc maps to closed field lines in the dawn to noon sector, with an equatorward edge generally located in the inner part of the ring current, typically at ~ 7 Saturn radii (RS) near dawn, and a poleward edge that maps variously between the centre of the ring current and beyond its outer edge at ~ 15 RS, depending on the latitudinal width of the arc. This location, together with a lack of response in properties to the concurrent IMF, suggests a principal connection with ring-current and nightside processes. The higher-latitude patchy auroras observed intermittently near to noon and at later local times extending towards dusk are instead found to straddle the model open–closed field boundary, thus mapping along field lines to the dayside outer magnetosphere and magnetopause. These emissions, which occur preferentially for northward IMF directions, are thus likely associated with reconnection and open-flux production at the magnetopause. One image for southward IMF also exhibits a prominent patch of very high latitude emissions extending poleward of patchy dawn arc emissions in the pre-noon sector. This is found to lie centrally within the region of open model field lines, suggesting an origin in the current system associated with lobe reconnection, similar to that observed in the terrestrial magnetosphere for northward IMF.</description><subject>Analysis</subject><subject>Geomagnetic fields</subject><subject>Magnetosphere</subject><subject>Saturn (Planet)</subject><issn>1432-0576</issn><issn>0992-7689</issn><issn>1432-0576</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNpNkc9OHSEUxieNTaq2D9AdLzAWhj8XlsZYNdG4UNfkAIcRMzPcMHMX7rrxCfqGfRKZextjSOA7H-f8Avma5iejZ5IZ8QumHnPLu1Zp03aUiS_NMRO1pnKjjj7pb83JPL9QShUz-rh5u4N-wiXP22csyZNxX1YREw6BjDngMKSpJzEXsjwjqWxGYAqr6Mj1wyN5gGVXJgK7kgsQD-MWUj_N5N-fvySN2yF5WFKuxoo4dA1kzrvikRTs16vvzdcIw4w__p-nzdPvy8eL6_b2_urm4vy29dzwpeUSFTpkASiVykSGUm4o53X36Lh3mjKvtORcdEZ5rY1yTsqgg0GOwfPT5ubADRle7LakEcqrzZDs3silt1Dq7we0wovofWRSMC1EBGcAPHOO0U10QcXKOjuweqjtaYp5KeDrCjgmnyeMqfrnQjPJheasDrDDgC95ngvGjwcwatcQ7T5EyztbQ7RriPwdAriS4w</recordid><startdate>20140627</startdate><enddate>20140627</enddate><creator>Belenkaya, E. S.</creator><creator>Cowley, S. W. H.</creator><creator>Meredith, C. J.</creator><creator>Nichols, J. D.</creator><creator>Kalegaev, V. V.</creator><creator>Alexeev, I. I.</creator><creator>Barinov, O. G.</creator><creator>Barinova, W. O.</creator><creator>Blokhina, M. S.</creator><general>Copernicus GmbH</general><general>Copernicus Publications</general><scope>AAYXX</scope><scope>CITATION</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0002-4041-0034</orcidid><orcidid>https://orcid.org/0000-0001-6183-4103</orcidid><orcidid>https://orcid.org/0000-0003-2057-5365</orcidid></search><sort><creationdate>20140627</creationdate><title>Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions</title><author>Belenkaya, E. S. ; Cowley, S. W. H. ; Meredith, C. J. ; Nichols, J. D. ; Kalegaev, V. V. ; Alexeev, I. I. ; Barinov, O. G. ; Barinova, W. O. ; Blokhina, M. S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Analysis</topic><topic>Geomagnetic fields</topic><topic>Magnetosphere</topic><topic>Saturn (Planet)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Belenkaya, E. S.</creatorcontrib><creatorcontrib>Cowley, S. W. H.</creatorcontrib><creatorcontrib>Meredith, C. J.</creatorcontrib><creatorcontrib>Nichols, J. D.</creatorcontrib><creatorcontrib>Kalegaev, V. V.</creatorcontrib><creatorcontrib>Alexeev, I. I.</creatorcontrib><creatorcontrib>Barinov, O. G.</creatorcontrib><creatorcontrib>Barinova, W. O.</creatorcontrib><creatorcontrib>Blokhina, M. S.</creatorcontrib><collection>CrossRef</collection><collection>Directory of Open Access Journals (Open Access)</collection><jtitle>Annales geophysicae (1988)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Belenkaya, E. S.</au><au>Cowley, S. W. H.</au><au>Meredith, C. J.</au><au>Nichols, J. D.</au><au>Kalegaev, V. V.</au><au>Alexeev, I. I.</au><au>Barinov, O. G.</au><au>Barinova, W. O.</au><au>Blokhina, M. S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions</atitle><jtitle>Annales geophysicae (1988)</jtitle><date>2014-06-27</date><risdate>2014</risdate><volume>32</volume><issue>6</issue><spage>689</spage><epage>704</epage><pages>689-704</pages><issn>1432-0576</issn><issn>0992-7689</issn><eissn>1432-0576</eissn><abstract>A unique set of images of Saturn's northern polar UV aurora was obtained by the Hubble Space Telescope in 2011 and 2012 at times when the Cassini spacecraft was located in the solar wind just upstream of Saturn's bow shock. This rare situation provides an opportunity to use the Kronian paraboloid magnetic field model to examine source locations of the bright auroral features by mapping them along field lines into the magnetosphere, taking account of the interplanetary magnetic field (IMF) measured near simultaneously by Cassini. It is found that the persistent dawn arc maps to closed field lines in the dawn to noon sector, with an equatorward edge generally located in the inner part of the ring current, typically at ~ 7 Saturn radii (RS) near dawn, and a poleward edge that maps variously between the centre of the ring current and beyond its outer edge at ~ 15 RS, depending on the latitudinal width of the arc. This location, together with a lack of response in properties to the concurrent IMF, suggests a principal connection with ring-current and nightside processes. The higher-latitude patchy auroras observed intermittently near to noon and at later local times extending towards dusk are instead found to straddle the model open–closed field boundary, thus mapping along field lines to the dayside outer magnetosphere and magnetopause. These emissions, which occur preferentially for northward IMF directions, are thus likely associated with reconnection and open-flux production at the magnetopause. One image for southward IMF also exhibits a prominent patch of very high latitude emissions extending poleward of patchy dawn arc emissions in the pre-noon sector. This is found to lie centrally within the region of open model field lines, suggesting an origin in the current system associated with lobe reconnection, similar to that observed in the terrestrial magnetosphere for northward IMF.</abstract><pub>Copernicus GmbH</pub><doi>10.5194/angeo-32-689-2014</doi><tpages>16</tpages><orcidid>https://orcid.org/0000-0002-4041-0034</orcidid><orcidid>https://orcid.org/0000-0001-6183-4103</orcidid><orcidid>https://orcid.org/0000-0003-2057-5365</orcidid><oa>free_for_read</oa></addata></record>
fulltext fulltext
identifier ISSN: 1432-0576
ispartof Annales geophysicae (1988), 2014-06, Vol.32 (6), p.689-704
issn 1432-0576
0992-7689
1432-0576
language eng
recordid cdi_doaj_primary_oai_doaj_org_article_4c4fccf1541844fab9aac1bb107fbd6f
source ProQuest - Publicly Available Content Database
subjects Analysis
Geomagnetic fields
Magnetosphere
Saturn (Planet)
title Magnetospheric magnetic field modelling for the 2011 and 2012 HST Saturn aurora campaigns – implications for auroral source regions
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-04T13%3A29%3A32IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_doaj_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Magnetospheric%20magnetic%20field%20modelling%20for%20the%202011%20and%202012%20HST%20Saturn%20aurora%20campaigns%20%E2%80%93%20implications%20for%20auroral%20source%20regions&rft.jtitle=Annales%20geophysicae%20(1988)&rft.au=Belenkaya,%20E.%20S.&rft.date=2014-06-27&rft.volume=32&rft.issue=6&rft.spage=689&rft.epage=704&rft.pages=689-704&rft.issn=1432-0576&rft.eissn=1432-0576&rft_id=info:doi/10.5194/angeo-32-689-2014&rft_dat=%3Cgale_doaj_%3EA481534831%3C/gale_doaj_%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-c393t-35e6ebe1da00569f1e557033557ceb3cb801c685334296c8896bb55d8d9e3edc3%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_id=info:pmid/&rft_galeid=A481534831&rfr_iscdi=true