| 1. Identity statement | ||||
| Reference Type | Conference Paper (Conference Proceedings) | |||
| Site | mtc-m21b.sid.inpe.br | |||
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Identifier | 8JMKD3MGP3W34P/3KQ6RCP | |||
| Repository | sid.inpe.br/mtc-m21b/2015/12.17.17.50 | |||
| Metadata Repository | sid.inpe.br/mtc-m21b/2015/12.17.17.50.27 | |||
| Metadata Last Update | 2018:06.04.02.55.59 (UTC) administrator | |||
| Secondary Key | INPE--PRE/ | |||
| Citation Key | AlvesEchTsuCosLak:2015:HiLaHe | |||
| Title | High latitude heliospheric magnetic decrease properties observed by Ulysses  | |||
| Year | 2015 | |||
| Access Date | 2024, May 17 | |||
| Secondary Type | PRE CI | |||
| 2. Context | ||||
| Author | 1 Alves, Maria Virgínia 2 Echer, Ezequeil 3 Tsurutani, B. T. 4 Costa Júnior, E. da 5 Lakhina, G. S. | |||
| Resume Identifier | 1 8JMKD3MGP5W/3C9JHRS | |||
| Group | 1 DGE-CEA-INPE-MCTI-GOV-BR 2 DGE-CEA-INPE-MCTI-GOV-BR | |||
| Affiliation | 1 Instituto Nacional de Pesquisas Espaciais (INPE) 2 Instituto Nacional de Pesquisas Espaciais (INPE) 3 Jet Propulsion Laboratory 4 Instituto Federal de Minas Gerais 5 Indian Institute for Geomagnetism | |||
| Author e-Mail Address | 1 mvirginia.alves@inpe.br 2 eecher@dge.inpe.br | |||
| Conference Name | IUGG General Assembly, 26 | |||
| Conference Location | Prague, Czech Republic | |||
| Date | 22 June - 02 July | |||
| History (UTC) | 2015-12-17 17:50:28 :: simone -> administrator :: 2018-06-04 02:55:59 :: administrator -> simone :: 2015 | |||
| 3. Content and structure | ||||
| Is the master or a copy? | is the master | |||
| Content Stage | completed | |||
| Transferable | 1 | |||
| Content Type | External Contribution | |||
| Abstract | Magnetic Decreases (MDs) are regions with abrupt decreases in the interplanetary magnetic field (IMF) magnitude. Ulysses spacecraft magnetic field and plasma data provide a unique opportunity to study MDs at high heliographic latitudes (HHL). We use a computer code on Ulysses high-resolution magnetic field data to obtain the MD occurrence rates and features under a variety of solar cycle and solar wind conditions. Ulysses first orbit had polar passes in 1994 (South Pole, S1) and 1995 (North Pole, N1), near the declining and solar minimum phases. The second orbit, with polar passes in 2000 (S2) and 2001 (N2), occurred during a solar maximum phase. The third orbit, with polar passes in 2007 (S3) and 2008 (N3), occurred near solar minimum, with an opposite solar magnetic field polarity of first pass. Among the six polar passes we found S1 and N1 are representatives for MDs occurring at HHLs during a typical solar minimum, when the solar plasma is mainly composed of high speed streams coming from coronal holes. For S1 we found a MD occurrence rate of ~12 MDs/day, an angular variation of IMF (Da) of ~27° and a duration time for MDs (Dt) of ~17s. For N1 we found a MD occurrence rate of ~15 MDs/day, Da~26° and Dt~20s. These results are quite different from the ones found for MDs at low heliographic latitudes: ~4 MDs/day, Dt~42s, and Da~6°. MDs that present Da<10° are usually attributed to mirror instability. The origin of MDs observed at HHLs is still an open question, and depends on a careful analysis of high resolution plasma parameters where MDs occur. The S2 pass shows several days where the MD occurrence rate is zero. Preliminary results indicate the absence of MDs are associated with low solar wind velocities, <500km/s, low density Np <1cm-3, and low beta, <1.0. | |||
| Area | CEA | |||
| Arrangement | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDGE > High latitude heliospheric... | |||
| doc Directory Content | there are no files | |||
| source Directory Content | there are no files | |||
| agreement Directory Content |
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| 4. Conditions of access and use | ||||
| User Group | simone | |||
| Visibility | shown | |||
| Read Permission | allow from all | |||
| Update Permission | not transferred | |||
| 5. Allied materials | ||||
| Mirror Repository | sid.inpe.br/mtc-m21b/2013/09.26.14.25.22 | |||
| Next Higher Units | 8JMKD3MGPCW/3EU29DP | |||
| Host Collection | sid.inpe.br/mtc-m21b/2013/09.26.14.25.20 | |||
| 6. Notes | ||||
| Empty Fields | archivingpolicy archivist booktitle callnumber copyholder copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor format isbn issn keywords label language lineage mark nextedition notes numberoffiles numberofvolumes orcid organization pages parameterlist parentrepositories previousedition previouslowerunit progress project publisher publisheraddress readergroup rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle size sponsor subject targetfile tertiarymark tertiarytype type url versiontype volume | |||
| 7. Description control | ||||
| e-Mail (login) | simone | |||
| update | ||||