Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Solar Connection of Enhanced Heavy Ion Charge States in the
  Interplanetary Medium: Implications for the Flux-rope Structure of CMEs   We investigated a set of 54 interplanetary coronal mass ejection (ICME)
events whose solar sources are very close to the disk center (within 15 degrees
from the central meridian). The ICMEs consisted of 23 magnetic cloud (MC)
events and 31 non-MC events. Our analyses suggest that the MC and non-MC ICMEs
have more or less the same eruption characteristics at the Sun in terms of soft
X-ray flares and CMEs. Both types have significant enhancements in charge
states, although the non-MC structures have slightly lower levels of
enhancement. The overall duration of charge state enhancement is also
considerably smaller than that than that in MCs as derived from solar wind
plasma and magnetic signatures. We find very good correlation between the Fe
and O charge state measurements and the flare properties such as soft X-ray
flare intensity and flare temperature for both MCs and non-MCs. These
observations suggest that both MC and non-MC ICMEs are likely to have a
flux-rope structure and the unfavorable observational geometry may be
responsible for the appearance of non-MC structures at 1 AU. We do not find any
evidence for active region expansion resulting in ICMEs lacking a flux rope
structure because the mechanism of producing high charge states and the flux
rope structure at the Sun is the same for MC and non-MC events.

23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex