INVESTIGADORES
CREMADES FERNANDEZ Maria Hebe
congresos y reuniones científicas
Título:
Tracking intense geomagnetic storms to the interplanetary medium and solar sources. A case of study
Autor/es:
B. SCHMIEDER; S. DASSO; C. H. MANDRINI; P. DÉMOULIN; A. N. ZHUKOV; A. ARAN; Y. CERRATO; C. CID; H. CREMADES; M. MENVIELLE; S. POEDTS; L. RODRIGUEZ; E. SAIZ
Lugar:
Berlin, Germany
Reunión:
Simposio; SCOSTEP's Symposium STP12; 2010
Institución organizadora:
SCOSTEP
Resumen:
p { margin-bottom: 0.08in; }
On May 15, 2005,
at 02:38 UT an interplanetary shock was recorded by
ACE. The
following interplanetary structure produced an important
geomagnetic
storm (minimal value of the Dst index -263 nT). Analysis of
interplanetary (plasma and magnetic) observations has shown that
these
disturbances could correspond to the arrival of magnetic
clouds.
The main trigger of the geomagnetic storm is definitively
the
fast halo CME of May 13 (LASCO) observed consequently to the
flare
occurring at 17:22 UT in the active region 10759. However,
the analysis
of the complexity of the magnetic cloud parameters
(ACE) leads us to
different possible scenarios for the
interpretation. The existence of
two clouds produced by two
different solar events on May 13 (two
different
filament
eruptions) is the more probable scenario.
The agreement between the
magnetic helicity sign in the source region
and the magnetic clouds,
together with the agreement between the MC axis orientations and the
polarity inversion line directions, support this view.