Global long-term trends in the total electron content
Annales Geophysicae,
Journal Year:
2025,
Volume and Issue:
43(1), P. 67 - 72
Published: Jan. 15, 2025
Abstract.
Total
electron
content
(TEC)
is
an
important
parameter
for
ionospheric
dynamics,
global
navigation
satellite
system/Global
Positioning
System
(GNSS/GPS)
signal
propagation
and
related
applications
of
GNSS/GPS
signals.
Despite
this
fact,
the
long-term
trends
in
TEC
have
been
studied
only
a
little.
Here,
we
analyze
JPL-35
(Jet
Propulsion
Laboratory-35)
homogeneous
series
data
1994–2014
selection
optimum
solar
activity
proxy
analyses
UPC
(Universitat
Politècnica
de
Catalunya)
over
2003–2023
estimating
TEC.
are
predominantly
negative.
reveal
clear
wavenumber
2
longitudinal
structure
low/equatorial
latitudes
with
strong
negative
belts
0–60
180–240°
E
weak
90–150
270–330°
E.
For
more
detailed
information
on
trends,
longer
reliable
required.
Language: Английский
A review of global long-term changes in the mesosphere, thermosphere and ionosphere: a starting point for inclusion in (semi-)empirical models
Advances in Space Research,
Journal Year:
2024,
Volume and Issue:
74(11), P. 5991 - 6011
Published: Oct. 10, 2024
Language: Английский
Long Term Global Ionospheric Total Electron Content Trend Analysis
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(21)
Published: Nov. 7, 2024
Abstract
Simulations
based
on
physical
models
of
the
thermosphere‐ionosphere
system
suggest
that
ionosphere
will
sink
as
thermosphere
cools
and
contracts
in
response
to
increasing
greenhouse
gas
concentrations.
As
a
consequence,
long‐term
trends
can
be
expected
ionospheric
parameters
such
as:
total
electron
content
(TEC),
critical
frequency
F2
layer,
foF2,
its
peak
height,
hmF2.
Since
early
1990s,
foF2
hmF2,
though
lesser
extent,
have
been
widely
analyzed
find
these
trends.
This
study
shows
TEC
for
period
1999–2023
from
available
global
International
GNSS
service
maps.
Using
F30,
F10.7
or
MgII
proxies
filter
out
effect
solar
EUV,
are
negative,
not
only
mean
value
but
also
most
regions
with
very
few
exceptions.
would
align
hypothesis,
even
our
results
show
higher
negative
trend
values
than
theoretically.
Language: Английский