Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks
Fast forward interplanetary shocks (FFS) are characterized by positive jump in all interplanetary plasma parameters (solar wind speed, temperature and density) and interplanetary magnetic field. However the fast reverse interplanetary shocks (FRS) are characterized by negative jump in all mentioned parameters except solar wind speed. Observations show that FFS cause positive sudden impulses (SI) while FRS cause negative SI in the H-component of the geomagnetic field. In this work we investigate the SI caused by interplanetary shocks. We use the observed plasma parameters, upstream and downstream, to calculate the variation of dynamic pressure. We observe that the SI amplitude is larger for positive SI than for negative ones, as a consequence of the fact that FFS have larger dynamic pressure variations as compared to FRS.
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Sociedade Brasileira de Geofísica
2007
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oai:scielo:S0102-261X20070006000212007-11-22Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocksAndrioli,Vânia FátimaEcher,EzequielSavian,Jairo FranciscoSchuch,Nelson Jorge Solar wind interplanetary shock waves sudden impulses magnetosphere Fast forward interplanetary shocks (FFS) are characterized by positive jump in all interplanetary plasma parameters (solar wind speed, temperature and density) and interplanetary magnetic field. However the fast reverse interplanetary shocks (FRS) are characterized by negative jump in all mentioned parameters except solar wind speed. Observations show that FFS cause positive sudden impulses (SI) while FRS cause negative SI in the H-component of the geomagnetic field. In this work we investigate the SI caused by interplanetary shocks. We use the observed plasma parameters, upstream and downstream, to calculate the variation of dynamic pressure. We observe that the SI amplitude is larger for positive SI than for negative ones, as a consequence of the fact that FFS have larger dynamic pressure variations as compared to FRS.info:eu-repo/semantics/openAccessSociedade Brasileira de GeofísicaRevista Brasileira de Geofísica v.25 suppl.2 20072007-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2007000600021en10.1590/S0102-261X2007000600021 |
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Andrioli,Vânia Fátima Echer,Ezequiel Savian,Jairo Francisco Schuch,Nelson Jorge |
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Andrioli,Vânia Fátima Echer,Ezequiel Savian,Jairo Francisco Schuch,Nelson Jorge Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
author_facet |
Andrioli,Vânia Fátima Echer,Ezequiel Savian,Jairo Francisco Schuch,Nelson Jorge |
author_sort |
Andrioli,Vânia Fátima |
title |
Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
title_short |
Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
title_full |
Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
title_fullStr |
Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
title_full_unstemmed |
Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
title_sort |
positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks |
description |
Fast forward interplanetary shocks (FFS) are characterized by positive jump in all interplanetary plasma parameters (solar wind speed, temperature and density) and interplanetary magnetic field. However the fast reverse interplanetary shocks (FRS) are characterized by negative jump in all mentioned parameters except solar wind speed. Observations show that FFS cause positive sudden impulses (SI) while FRS cause negative SI in the H-component of the geomagnetic field. In this work we investigate the SI caused by interplanetary shocks. We use the observed plasma parameters, upstream and downstream, to calculate the variation of dynamic pressure. We observe that the SI amplitude is larger for positive SI than for negative ones, as a consequence of the fact that FFS have larger dynamic pressure variations as compared to FRS. |
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Sociedade Brasileira de Geofísica |
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2007 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2007000600021 |
work_keys_str_mv |
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