plasma effects on transionospheric propagation of radio waves...
TRANSCRIPT
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Plas
ma
effe
cts
on tr
ansi
onos
pher
icpr
opag
atio
n of
radi
o w
aves
IIPl
asm
a ef
fect
s on
Pl
asm
a ef
fect
s on
tran
sion
osph
eric
tran
sion
osph
eric
prop
agat
ion
of ra
dio
wav
es II
prop
agat
ion
of ra
dio
wav
es II
R. L
eitin
ger
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
•G
ener
al re
mar
ks•
Rem
inde
r on
(tran
sion
osph
eric
) wav
e pr
opag
atio
n•
Rem
inde
r of p
ropa
gatio
n ef
fect
s•
GPS
as
a da
ta s
ourc
e•
Som
e el
ectr
on c
onte
nt e
xam
ples
Seco
nd le
ctur
e: M
oder
n ap
plic
atio
ns
•TE
CTE
C m
appi
ng, a
dapt
ive
mod
ellin
g, (d
ata
inge
stio
n in
to m
odel
s, d
ata
assi
mila
tion)
•In
vers
ion
Tom
ogra
phy
3D a
nd 4
D im
agin
g (fi
lling
vox
els
with
dat
a)
Iono
sphe
ric R
adio
Occ
ulta
tion
•Th
e im
port
ance
of a
sses
smen
t stu
dies
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
GPS
as
a da
ta s
ourc
eTh
e “c
lass
ical
” TEC
sou
rces
pro
vide
dor
fixe
d ge
omet
ry a
nd h
igh
tem
pora
l res
olut
ion
(GEO
Far
aday
bea
cons
)or
nea
rly c
onst
ant L
ocal
Tim
e an
d hi
gh s
patia
l (la
titud
inal
) res
olut
ion
(LEO
Diff
.D
oppl
er b
eaco
ns)
true
sign
al a
mpl
itude
and
pha
seG
PS (M
EO o
rbit;
12
hour
per
iod,
incl
inat
ion
53 d
egre
es)
mix
es te
mpo
ral a
nd s
patia
l dep
ende
nce
(diu
rnal
cur
ves
of T
EC fo
r a g
iven
loca
tion
are
alw
ays
com
posi
tes,
etc
.)N
eeds
com
plic
ated
“cal
ibra
tion”
pro
cedu
res
(CO
DE
= G
roup
Del
ay n
eeds
kno
wle
dge
of tr
ansm
itter
and
rece
iver
del
ays
and
cann
otpr
ovid
e su
ffici
ent r
esol
utio
n fo
r sci
ence
app
licat
ions
, PH
ASE
= D
iff. D
oppl
er s
uffe
rsfro
m 2
am
bigu
ity
CO
DE
and
PHAS
E co
mbi
natio
n ne
eded
for a
ll sc
ienc
eap
plic
atio
ns)
Am
plitu
de a
nd p
hase
are
“re
cons
truc
ted”
in th
e re
ceiv
erG
PS-s
TEC
is th
e su
m o
f ion
osph
eric
plu
s pl
asm
asph
eric
con
tent
Ther
efor
e: T
EC m
appi
ng, a
dapt
ive
mod
ellin
g, d
ata
inge
stio
n in
to m
odel
s, …
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exam
ple
for F
arad
ay o
bser
vatio
ns o
n th
e si
gnal
s of
the
geos
tatio
nary
sat
ellit
e M
ETEO
SAT-
2 m
ade
at F
irenz
e on
25 a
nd 2
6 M
ay, 1
991.
TEC
in u
nits
of 1
015 m
− 2 v
s.U
nive
rsal
Tim
e in
hou
rs. D
iurn
al c
urve
; str
ong
day
toda
y va
riatio
ns; v
ery
stro
ng T
ID a
ctiv
ity o
n 25
May
.
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exam
ple
for a
str
ong
posi
tive
stor
m e
ffect
in io
nosp
heric
ele
ctro
n co
nten
t: Su
dden
Com
men
cem
ent o
f the
geo
mag
netic
stor
m (S
SC) o
n 4
Febr
urar
y, 1
983,
16:
15 U
T, D
st-m
inim
a: -1
59 n
T on
4 F
eb.,
20 U
T, -1
69 n
T on
5 F
eb.,
11 U
T. F
arad
ay e
ffect
on g
eost
atio
nary
sat
ellit
e si
gnal
rece
ived
at H
amilt
on, M
A, U
SA (4
00 k
m io
nosp
h. p
oint
: 39°
N, 2
89°E
; geo
mag
n. la
t. 50
°).
Ord
inat
e: e
lect
ron
cont
ent i
n un
its o
f 1015
m− 2
, abs
ciss
a: U
nive
rsal
Tim
e (U
T). 3
Feb
ruar
y; q
uiet
refe
renc
e da
y (A
p=7)
.In
term
edia
te le
vel o
f sol
ar a
ctiv
ity (m
onth
ly m
ean
suns
pot n
umbe
r R=5
1).
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exam
ple
for a
str
ong
nega
tive
stor
m e
ffect
in io
nosp
heric
ele
ctro
n co
nten
t: Su
dden
Com
men
cem
ent o
f the
geo
mag
netic
stor
m (S
SC) o
n 11
Apr
il, 1
981,
13:
39 U
T, D
st-m
inim
a: -1
67 n
T on
12
April
, 6 U
T, -2
91 n
T on
13
April
, 7 U
T. F
arad
ay e
ffect
on
geos
tatio
nary
sat
ellit
e si
gnal
rece
ived
at M
adrid
, Spa
in (4
00 k
m io
nosp
h. p
oint
: 37°
N, -
4°E;
geo
mag
n. la
t. 41
°). O
rdin
ate:
elec
tron
cont
ent i
n un
its o
f 1015
m− 2
, abs
ciss
a: U
nive
rsal
Tim
e (U
T). 1
1 Ap
ril w
as a
slig
htly
dis
turb
ed d
ay (A
p=39
). Th
e ne
gativ
est
orm
effe
ct w
as p
rono
unce
d in
the
long
itude
zon
e ar
ound
0° o
nly.
Hig
h so
lar a
ctiv
ity (m
onth
ly m
ean
R=1
56).
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exam
ple
for l
atitu
dina
l pro
files
of v
ertic
al e
lect
ron
cont
ent f
rom
NN
SS o
bser
vatio
ns m
ade
at G
raz
dem
onst
ratin
g th
e po
tent
ial
of c
ombi
ned
obse
rvat
ions
for t
imes
of h
igh
sola
r act
ivity
. Dat
aof
1 N
ovem
ber,
1990
. Ele
ctro
n co
nten
t in
units
of 1
015 m
− 2 v
s.ge
ogr,
latit
ude
in d
eg. N
(N to
S).
Upp
er p
anel
: tra
ces
of th
eio
nosp
heric
poi
nts
(in 4
00 k
m h
eigh
t) in
a g
eogr
aphi
c sy
stem
.Ev
en fo
r mid
latit
udes
the
equa
toria
l ano
mal
y is
impo
rtan
t!
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exam
ple
for l
atitu
dina
l pro
files
of v
ertic
al e
lect
ron
cont
ent f
rom
NN
SS o
bser
vatio
ns m
ade
at G
raz
dem
onst
ratin
g th
e po
tent
ial
of c
ombi
ned
obse
rvat
ions
for t
imes
of h
igh
sola
r act
ivity
.Af
tern
oon/
even
ing
of 2
Nov
embe
r, 19
90. E
lect
ron
cont
ent i
nun
its o
f 1015
m− 2
vs.
geo
gr, l
atitu
de in
deg
. N (N
to S
). U
pper
pane
l: tra
ces
of th
e io
nosp
heric
poi
nts
(in 4
00 k
m h
eigh
t) in
age
ogra
phic
sys
tem
. In
the
early
eve
ning
the
effe
ct o
f the
equa
toria
l ano
mal
y is
eve
n m
ore
pron
ounc
ed!
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Latit
ude
depe
nden
ce o
f TEC
from
Diff
. Dop
pler
on
the
150/
400
MH
z si
gnal
s of
NN
SS. R
ecei
ving
sta
tions
Gra
z(4
7.1°
N, 1
5.5°
E) a
nd U
ppsa
la (5
9.8°
N, 1
7.6°
E). T
ypic
aleq
ujin
ox/w
inte
r nig
ht p
rofil
e. M
ain
troug
h w
ith m
inim
umar
ound
60°
N. I
ndic
atio
n of
TEC
incr
ease
tow
ards
the
equa
toria
l ano
mal
y in
the
Sout
h. 1
8 O
ctob
er, 1
989
arou
nd 2
1:10
UT.
TEC
in u
nits
of 1
015 m
− 2 v
s ge
ogra
phic
latit
ude.
Upp
er p
anel
: tra
ces
of th
e io
nosp
heric
poi
nts
(in40
0 km
hei
ght)
in a
geo
grap
hic
syst
em. H
igh
sola
r act
ivity
(mon
thly
mea
n R
=159
, mon
thly
mea
n 10
.7 c
m s
olar
radi
oflu
x: 2
09 u
nits
).
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Latit
ude
depe
nden
ce o
f TEC
from
Diff
. Dop
pler
on
the
150
/ 400
MH
z si
gnal
s of
NN
SS. R
ecei
ving
sta
tion
Dio
nyso
s (3
8.1°
N,
23.0
°E) a
nd U
ppsa
la (5
9.8°
N, 1
7.6°
E). T
EC in
uni
ts o
f 1016
m− 2
vs
geog
raph
ic la
titud
e. 8
Apr
il, 1
981,
aro
und
11:4
0 U
T.M
onth
ly m
ean
R=1
56, m
onth
ly m
ean
10.7
cm
sol
ar ra
dio
flux:
223
uni
ts).
Geo
mag
netic
ally
nea
rly q
uiet
(Ap=
11).
Very
hig
h va
lues
of
TEC
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Elec
tron
con
tent
(TEC
) map
s g
loba
l (bi
-hou
rly)
regi
onal
(30
min
utes
)(s
omeh
ow) b
ased
on
mod
els
glob
al m
aps
need
dat
a in
terp
olat
ion
(dire
ctly
or i
ndire
ctly
by
mod
el)
Inte
rnat
iona
l GPS
Ser
vice
(IG
S): 6
glo
bal m
aps
(by
thei
r reg
iona
lce
nter
s) +
one
offi
cial
pro
duct
(= a
vera
ge !!
)
La P
lata
map
s
DLR
Neu
stre
litz
regi
onal
map
s (b
ased
on
adap
tive
mod
el)
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
tom
ogra
phy
occu
ltatio
n in
vers
ion
com
bine
d sp
ace-
grou
ndto
mog
raph
y
Iono
sphe
ric R
adio
Occ
ulta
tion
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
„Occ
ulta
tion“
rays
from
the
GN
S to
the
LEO
. Sla
nt e
lect
ron
cont
ent (
sTEC
)co
nsis
ts o
f thr
ee p
arts
: ion
osph
ere
(P to
P’),
upp
erm
ost i
onos
pher
e (P
’ to
U in
2000
km
hei
ght),
pla
smas
pher
e (U
to G
). Ea
ch ra
y ca
n be
cha
ract
eris
ed b
y its
perig
ee (t
ange
nt p
oint
). In
real
ity th
e ra
ys a
re n
ot c
o-pl
anar
and
the
loca
tion
ofth
eir p
erig
ees
form
s a
3D c
urve
. Its
pro
ject
ion
to th
e su
rface
of t
he E
arth
is th
e„s
ink
path
“. U
seab
le („
good
“) o
ccul
tatio
ns h
ave
a io
nosp
heric
sin
k pa
th le
ngth
of
< 10
° (gr
ound
occ
ulta
tion
poin
t to
perig
ee o
f the
hig
hest
pos
sibl
e ra
y).
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Iono
sphe
ric u
se o
f Rad
io O
ccul
tatio
n•
Prim
ary
info
rmat
ion
are
(unc
alib
rate
d) G
NS
to L
EO e
lect
ron
cont
ent v
alue
s I s
usua
lly g
aine
d by
mea
ns o
f car
rier p
hase
diff
eren
ces.
Subt
ract
ion
of th
e el
ectro
n co
nten
ts o
f “u
pper
mos
t ion
osph
ere”
and
“pla
smas
pher
e” le
ads
to th
e “i
onos
pher
ic”
elec
tron
con
tent
whi
ch is
sub
ject
edto
inve
rsio
n
I I = I s
- I U
- I P
•R
efra
ctio
n (ra
y be
ndin
g) is
neg
ligib
le
⇒ s
traig
ht li
ne p
ropa
gatio
n is
ass
umed
⇒ c
ontin
uous
sol
utio
ns a
re u
niqu
e ev
en if
refra
ctiv
ity is
not
incr
easi
ng /
decr
easi
ng m
onot
onou
sly
(ver
y im
porta
nt b
ecau
se o
f ele
ctro
n de
nsity
pro
files
with
F2 m
axim
um (a
nd E
max
imum
).
⇒ d
iscr
ete
prob
lem
has
stra
ight
forw
ard
trian
gula
r des
ign
mat
rix (c
onsi
sts
of p
ath
leng
th e
lem
ents
)
⇒ (“
onio
n pe
elin
g”) s
olut
ions
are
inhe
rent
ly s
tabl
e w
ith e
rror a
ccum
ulat
ion
in th
ebo
ttom
of t
he e
lect
ron
dens
ity p
rofil
e
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Iono
sphe
ric u
se o
f Rad
io O
ccul
tatio
n•
We
shou
ld d
istin
guis
h be
twee
na)
“hig
h” L
EO o
rbit
( hLE
O>7
00 k
m) (
HL)
and
b) “l
ow” L
EO o
rbit
( hLE
O<7
00 k
m) (
LL) c
ases
LL e
xper
ienc
e fro
m C
HAM
P ( C
HA
lleng
ing
Min
isat
ellit
e Pa
yloa
d):
h
LEO
> h m
F2 i
s a
nece
ssar
y co
nditi
on fo
r “io
nosp
heric
” inv
ersi
on!
•H
L: M
odel
ass
ista
nce
of a
dvan
tage
in re
mov
ing
I U a
nd I P
LL: M
odel
ass
ista
nce
and/
or “h
igh
elev
atio
n” e
lect
ron
cont
ent d
ata
(LEO
toad
ditio
nal G
NS)
nec
essa
ry in
rem
ovin
g I U
and
I P•
Mod
el a
ssis
tanc
e ca
n st
rong
ly im
prov
e th
e re
liabi
lity
of in
vers
ion
resu
lts in
the
vici
nity
of i
onis
atio
n rid
ges
(max
ima
in th
e TE
C d
istr
ibut
ion)
and
trou
ghs
(min
ima
in th
e TE
C d
istr
ibut
ion)
An
othe
r typ
e of
mod
el a
ssis
tanc
e w
as v
ery
succ
essf
ul in
CH
AM
Pin
vers
ion
(N. J
akow
ski e
t al.
at D
LR N
eust
relit
z) (a
dapt
ive
mod
els
for t
he io
nosp
here
[and
pla
smas
pher
e] a
bove
the
CH
AM
P or
bit)
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Exte
nsiv
e ca
lcul
atio
ns w
ere
carri
ed o
ut o
n th
e ba
sis
of th
e th
ree
dim
ensi
onal
and
time
depe
nden
t ion
osph
ere/
plas
mas
pher
e m
odel
NeU
oG-p
las
(Hoc
hegg
eran
d Le
iting
er, 2
000)
. Th
e fo
llow
ing
four
par
amet
ers
of e
lect
ron
dens
ity h
eigh
tpr
ofile
s w
ere
inve
stig
ated
:
- pea
k he
ight
hm
F2,
(bes
t – e
rror <
20 k
m in
mor
e th
an 5
0% o
f the
cas
es)
- pea
k el
ectro
n de
nsity
Nm
F2, (
seco
nd –
for f
ar m
ore
than
50%
of t
he c
ases
erro
r <15
%.
- top
side
sca
le h
eigh
t or t
opsi
de s
lab
thic
knes
s,
- a s
hape
par
amet
er fo
r the
bot
tom
side
iono
sphe
re (n
ot re
ally
goo
d).
The
low
latit
udes
exc
eptio
n re
gion
: vic
inity
of o
ne o
f the
cre
sts
of th
eeq
uato
rial a
nom
aly
and
(to a
less
er d
egre
e) th
e re
gion
aro
und
the
dip
equa
tor
– m
odel
ass
ista
nce
can
impr
ove
situ
atio
n su
bsta
ntia
lly
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Nec
essi
ty o
f Ass
essm
ent s
tudi
es o
n th
e ba
sis
of re
alis
tic m
odel
s•
Cal
cula
te a
rtific
ial t
rans
mitt
er to
rece
iver
ele
ctro
n co
nten
ts (s
TEC
)
•Su
bjec
t sTE
C s
erie
s to
retri
eval
/ in
vers
ion
met
hod
•C
ompa
re re
triev
al /
inve
rsio
n re
sults
with
“m
odel
trut
h”
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Elec
tron
dens
ity fr
om N
eUoG
-pla
s3
GN
S to
LEO
rays
: gro
und
occu
ltatio
n(ta
ngen
t hei
ght h
t = 0
km
), ne
ar F
laye
r pea
k(h
t = 3
00 k
m),
“hig
h” ra
y (h
t = 3
00 k
m).
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
heig
ht p
rofil
es o
f ele
ctro
n de
nsity
;bl
ack:
giv
en p
rofil
e, b
lue:
dire
ctin
vers
ion,
red:
mod
el a
ssis
ted
inve
rsio
n.
Hor
izon
tal d
istri
butio
n of
Nm
ax(c
onto
urs
over
geo
grap
hic
syst
ems)
in th
e oc
culta
tion
regi
on; b
lue
low
valu
es, r
ed h
igh
valu
es; o
ccul
tatio
nra
ys (t
hin
red)
and
occ
ulta
tion
path
(thic
k re
d).
Nm
ax d
istri
butio
n al
ong
the
grou
ndoc
culta
tion
ray
botto
m: s
ymm
etric
(red
) and
ant
imet
ric (l
ight
blu
e) p
art.
Dat
a ba
se: a
rtific
ial s
TEC
val
ues,
cal
cula
ted
by m
eans
of N
eUoG
-pla
s w
ith o
ne G
PS to
LEO
scen
ario
shi
fted
in g
eogr
aphi
c la
titud
e, s
easo
n an
d lo
cal t
ime
to e
ncou
nter
cre
st a
nd v
alle
yco
nditi
ons.
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
heig
ht p
rofil
es o
f ele
ctro
n de
nsity
;bl
ack:
giv
en p
rofil
e, b
lue:
dire
ctin
vers
ion,
red:
mod
el a
ssis
ted
inve
rsio
n.
Hor
izon
tal d
istri
butio
n of
Nm
ax(c
onto
urs
over
geo
grap
hic
syst
ems)
in th
e oc
culta
tion
regi
on; b
lue
low
valu
es, r
ed h
igh
valu
es; o
ccul
tatio
nra
ys (t
hin
red)
and
occ
ulta
tion
path
(thic
k re
d).
Nm
ax d
istri
butio
n al
ong
the
grou
ndoc
culta
tion
ray
botto
m: s
ymm
etric
par
t (re
d) a
nd m
odel
for i
t (bl
ue).
Dat
a ba
se: a
rtific
ial s
TEC
val
ues,
cal
cula
ted
by m
eans
of N
eUoG
-pla
s w
ith o
ne G
PS to
LEO
scen
ario
shi
fted
in g
eogr
aphi
c la
titud
e, s
easo
n an
d lo
cal t
ime
to e
ncou
nter
cre
st a
nd v
alle
yco
nditi
ons.
Inte
rnat
iona
l Sum
mer
Sch
ool f
or Io
nosp
heric
Phy
sics
, Eric
e, 2
4-29
Sep
tem
ber 2
004
R. L
eitin
ger,
Uni
v. G
raz,
I. o
f Phy
sics
, I. f
or G
eoph
ysic
s, A
stro
phys
ics
and
Met
eoro
logy
Tran
siono
sphe
ric p
ropa
gatio
n of
radi
o wa
ves
Than
k yo
u fo
r you
r atte
ntio
nTh
ank
you
for y
our a
ttent
ion