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		<secondarykey>INPE-10363-PRE/5864</secondarykey>
		<citationkey>EcherAGGBSVDG:2003:InAs</citationkey>
		<title>Comparison between april 1999 and february 2000 solar-terrestrial connection events: interplanetary aspects</title>
		<format>On-line</format>
		<year>2003</year>
		<date>2003</date>
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		<size>452 KiB</size>
		<author>Echer, Ezequiel,</author>
		<author>Alves, Maria Virgínia,</author>
		<author>González-Alarcon, Walter Demétrio,</author>
		<author>Gonzalez-Alarcon, Alicia Luisa Clua de,</author>
		<author>Balmaceda, L. A.,</author>
		<author>Santos, C.,</author>
		<author>Vieira, Luiz Eduardo Antunes,</author>
		<author>Dal Lago, Alisson,</author>
		<author>Guarnieri, Fernando Luís,</author>
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		<resumeid>8JMKD3MGP5W/3C9JGH3</resumeid>
		<group>LAP-INPE-MCT-BR</group>
		<group>DGE-INPE-MCT-BR</group>
		<group>RSU-INPE-MCT-BR</group>
		<conferencename>Latin American Workshop on Plasma Physics, 10;  Brazilian Meeting on Plasma Physics, 7 (São Pedro, SP, Brazil, 2003).</conferencename>
		<conferencelocation>São Pedro, 2003</conferencelocation>
		<booktitle>Anais</booktitle>
		<secondarytype>PRE CI</secondarytype>
		<tertiarytype>Posters</tertiarytype>
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		<contenttype>External Contribution</contenttype>
		<keywords>física básica de plasma, geomagnetic storms.</keywords>
		<abstract>The strong geomagnetic storms on April 17th 1999 (Dst peak = -91 nT) and on February 12th 2000 (Dst peak = -131 nT) were caused by different interplanetary structures. The April 1999 event was caused by a south-north fast magnetic cloud, which drove an interplanetary shock detected at 1 astronomical unit (UA) at 10:30 UT on April 16th 1999. This interplanetary shock had Alfvenic Mach number of about 2.5. The magnetic cloud arrived at UA around 23:00 UT on April 16th and ended around 19:00 UT on April 17th. The southward component of the interplanetary magnetic field remained above -10 nT for 5 hours, with peak value of -14 nT. The February 2000 event was caused by the interaction of two interplanetary remnants of coronal mass ejections. Two interplanetary shocks were detected on February 11th 2000 at 02:00 and at 23:00 UT. These shocks had Alfvenic Mach numbers of about 2.0 and 2.8, respectively, and were driven by interplanetary ejecta. The first interplanetary ejecta arrived at 1 UA around 16:00 UT on February 11th. However, it was engulfed by the second one around 20:00 UT on the same day, creating an intense and highly turbulent southward magnetic field, which remained above -10 nT for 3 hours, with peak value of -16 nT. In this paper the interplanetary aspects of these two solar-terrestrial connection events are analyzed and compared. Plasma and magnetic field data obtained from sensors on board ACE spacecraft orbiting L1 point are used.</abstract>
		<area>FISPLASMA</area>
		<language>en</language>
		<targetfile>comparison.pdf</targetfile>
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