@InProceedings{DalLago:2022:OrICHi,
author = "Dal Lago, Alisson",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Origins of ICME-Sheath High Intensity Magnetic Fields and their
Geomagnetic Impacts",
year = "2022",
organization = "AGU Fall Meeting",
publisher = "AGU",
abstract = "In this work we study high intensity magnetic fields in ICME
sheath regions. These high intensity fields are short duration
when compared to the total duration extent of the ICMEs but they
often drive intense geomagnetic disturbances. The selection of the
events is via visual inspection of interplanetary data observed by
L1 interplanetary monitors. We sort these events by their magnetic
field profile: a very high intensity B within the sheath, followed
by a smooth region, which could be interpreted as the ICME. We
look at their solar counterparts and study their dynamics from the
Sun to the Earth. As expected, our findings show that high speed
coronal mass ejections (CMEs) are related to the occurrence of
these high intensity sheath magnetic fields. However, we find
important exceptions which deserve more careful study. To evaluate
the geomagnetic impacts we use the Disturbance Storm-time Dst
index. In the context of Space Weather, it is known that shock
sheath fields are a very important origins of energy injection in
the Earths magnetosphere.",
conference-location = "Chicago, IL",
conference-year = "12-16 Dec. 2022",
urlaccessdate = "23 maio 2024"
}