Armin Nabizadeh*
Nasrin Talebpour Sheshvan
Ali Ajabshirizadeh
RIAAM & University of Tabriz
* [email protected]
 Out Line
• Brief Introduction
• CMEs’ parameters
• Results
• Conclusion
• Solar Flare
• Coronal Mass Ejection (CME)
• Solar Energetic Particle (SEP)
 CME
The outer solar atmosphere, the
corona, is structured by strong
magnetic fields. Where these fields are
closed, often above sunspot groups, the
confined solar atmosphere can
suddenly and violently release bubbles
of gas and magnetic fields called
coronal mass ejections. A large CME
can contain a billion tons of matter that
can be accelerated to several million
miles per hour in a spectacular
explosion. Solar material streams out
through the interplanetary medium,
impacting any planet or spacecraft in
its path. CMEs are sometimes
associated with flares but can occur
independently.
- Whether a CME is able to intercept the Earth depends on its
propagation direction in the heliosphere.
- A halo CME (360 degree of angular width) is likely to have a
component moving along the Sun-Earth connection line
- A halo is a projection effect; it happens when a CME is initiated close
to the disk center and thus moves along the Sun-Earth connection line.
- Therefore, a halo CME is possibly geo-effective.
N
• Position Angle (PA)
• Angular Width (W)
• Speed (m/s)
AW = 80 degrees
AW = 360 degrees, halo CME
SOHO LASCO CME Catalog
http://cdaw.gsfc.nasa.gov/CME_list/
http://cdaw.gsfc.nasa.gov/index.html
http://cdaw.gsfc.nasa.gov/CME_list/halo/hal
o.html
Slow CME : ( V≤ 300 Km/s )
Fast CME : ( V > 1000 Km/s )
Narrow CME : ( W ≤ 30 º )
Narrow CMEs (WA ≤ 30°)
Fast CME ( V >1000 Km/s )
0.047 %
41.423%
Intermediate CME
(300< V <1000 Km/s )
58.53 %
Slow CME
( V < 300 Km/s )
Slow CMEs (V ≤ 300 Km/s)
Wide CME
(W >120 ̊ )
Halo CME
0.11 %
1.66 %
32.69 %
65.54 %
Intermediate CME
( 30 ̊ <W<120 ̊ )
Narrow CME
( W < 30 ̊ )
Slow CME
( V < 300 Km/s )
Fast CME ( V >1000 Km/s )
15.13 %
18.49 %
66.38%
Intermediate CME
(300< V <1000 Km/s )
Wide CMEs (WA ≥ 120°)
Fast CMEs (V ≥ 1000 Km/s)
Narrow CME
( W < 30 ̊ )
Intermediate CME
( 30 ̊ <W<120 ̊ )
4.35 %
Halo CME
50.71 %
17.4 %
27.54 %
Wide CME
(W >120 ̊ )
North Hemisphere
55.82 %
South Hemisphere
44.18 %
Narrow CMEs (WA ≤ 30°)
Wide CMEs (WA ≥ 120°)
Halo CME
North Hemisphere
Halo CME
24.9 %
48.48 %
26.72 %
South Hemisphere
All CMEs occurred in period of Jan to Oct 2012
N=600
N=466
N=392
N=402
EP
1. EP is a good indicator of
the CME source position
in latitude .
2. The CMEs associated with EPs
are located in the immediate
vicinity of the plane of the
sky, minimizing the projection
effects on the apparent CME
angular width and front velocity.
CME
axis
axis
Limb Events With Eruptive Prominence During
First Phase Of
Solar Cycle 23 (1996-2001)
Solar Cycle 24 (2007-2012)
All CMEs position Angle Occurred in the period of
2007-2012
Percent
30
28.39
25
20
24.07
25.24
21
15
10
5
1.7
Position
Angle
We studied all the CMEs (6905) (LASCO CME Catalog) occurred in
2007 to 2012 at the rise of the cycle 24, involving narrow and
wide CMEs, Halo CMEs. After data analyzing and the evolution of
CME parameters, the following conclusions can be drawn about
this study:
1.
Wide CME
(AW > 120 ̊ )
61.96 % of them were narrow
CMEs with width angle less than
30°. 32.87 % of them were between
30°≤ WA ≤120°. Only 5.17 % of
them were wide CMEs with
AW ≥ 120°.
Narrow CME
( AW ≤ 30 ̊ )
Intermediate CME
( 30 ̊ < AW≤ 120 ̊ )
Fast CME
( V >1000 Km/s )
2.
1.7%
57.61 % of them were slow
CMEs with a speed less than 300
Km/s. 40.68 % of them were CMEs
with 300 ≤ S ≤ 1000.
Only 1.7 % of them were fast CMEs
with S ≥ 1000. In similar case for
solar cycle 23 (1996 to 2001),
from all CMEs (4589),175 CMEs
speed were more than 1000,
which means 3.81 %.
Intermediate CME
(300 < V ≤1000 Km/s )
Slow CME
( V ≤ 300 Km/s )
3.
There is good correlation between speed and angular
width.
4.
The number of CMEs in 0-90 degrees was more than
the other parts and it was 28.39 %. In addition, the north
hemisphere with 53.62 % of all CMEs was more active than
the south hemisphere with 45.07 %a.
Data show that in the solar cycle 23 and
24 northwest of the Sun was more active
than the other. Therefore, this issue can be
a good subject for following studies.
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Thank You
for Your
Attention