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| Titel |
Large-scale structures of solar wind during 1976-2000: occurrence rate and geoeffectiveness. |
| VerfasserIn |
Yu. I. Yermolaev, N. S. Nikolaeva, I. G. Lodkina, M. Yu. Yermolaev |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022682
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| Zusammenfassung |
| On the basis of the OMNI database of interplanetary measurements we identified solar wind
(SW) types for all time intervals during 1976–2000. Our classification includes quasi-steady
types: (1) heliospheric current sheet (HCS), (2) slow and (3) fast SW streams, and disturbed
types: (4) corotating interaction regions (CIR), (5) sheath and (6) magnetic cloud (MC) and
(7) ejecta as well as (8) direct and (9) reverse interplanetary shocks (see catalogue on site
ftp://ftp.iki.rssi.ru/pub/omni/). We discuss several preliminary results obtained with our
catalogue (see more details in http://www.iki.rssi.ru./people/yyermol_inf.html).
HCS was observed during ~6% of total time of observations, CIR ~10%, Ejecta
~20%, MC ~2%, Sheath before Ejecta ~8%, Sheath before MC ~0.8%, Fast SW
streams ~21% and Slow ones ~31%. Geoeffectiveness for different types of SW
structures was 0.63 for MC with Sheath (0.15 for Sheath before MC and 0.54 for
MC), 0.21 for Ejecta Sheath (0.15 for Sheath before Ejecta and 0.08 for Ejecta),
and 0.20 for CIR. Solar cycle variations of these parameters are discussed. The
work was supported by the RFBR, project nos. 04-02-13161 and 07-02-00042. |
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