ar noaa 10798 & 10808 (august-september, 2005)
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AR NOAA 10798 & 10808(August-September, 2005)
Ayumi AsaiNobeyama Solar Radio Observatory, NAOJ
December 11, 2005CAWSES WS
@Stanford
Nobeyama Solar Radio Observatory
Nobeyama Radio PolarimeterNobeyama Radioheliograph
SOHO/MDI Face-on movie
Evolution NOAA 10798
emergence!
GOES light curve (NOAA10798)
• 3 M-class flares occurred
Coronal Features of NOAA 10798
• SOHO/EIT (195A)
NOAA 10798
CH
10797
New AR appears in a small coronal hole
Coronal Features of NOAA 10798
SOHO/EIT (195A)
CH
NOAA 10798
Anemone structure!
Anemone Structure
• Anemone structure – ARs which appear in CHs (not so active)
• Source of gigantic jets
Flare1: 2005/08/22 00:44UT
• near the west limb (S11 W62)• M-class flares• LDE• ejection Halo-CME
SOHO/EIT (195) movie
CMEs of NOAA 10798
• Halo-CMEs• NOAA 10798 is locate
d near the southwest limb
• 08/22 (M2.6) 01h
• 08/22 (M5.6) 17h
• wide CME
magnetic configuration (CH)?
SOHO/LASCO C3
Summary of NOAA 10798
• Characteristics of the AR NOAA10798 which is the AR of NOAA 10808 in the previous rotation
• rapidly evolved (especially in the second half of the path)
• showed anemone-type structure (appeared in a small CH)
• M-class flare occurred near the southwest limb• Nevertheless, generated a halo-type CMEwide angle CMEmagnetic configuration? (CH?)
Backside CME!• Backside Halo-CME (AR is evolving!)2005-Aug-31 LASCO/C2
SOHO/EIT (195)
Short Break
SOHO/MDI Face-on movie
Evolution NOAA 10808
Evolution of AR
GOES/SXI
GOES light curve (NOAA10808)
• 10 X-class, 20 M-class flares occurred
Phase 1: poor observation• 2005/09/07 17:17UT (X17.0)• 2005/09/08 20:52UT (X5.4)
• Huge flares (X17, X5.4)• No EIT, No MDI, No
LASCO• TRACE movie shows
ejection
Phase 2: geo-effective flare• 2005/09/09 09:42UT (X3.6)• 2005/09/09 19:13UT (X6.2)
CMEs of 2005-Sep-09 Flare
• AR was located near the limb• Halo-CMEs
SOHO/LASCO C3SOHO/LASCO C2
Phase 3: LDE flares• 2005/09/10 21:30UT (X2.1)• 2005/09/11 12:44UT (M3.0)
Site of Flares (LDEs)
SOHO/MDI TRACE (171)
100 arcsec
Site of Flares (LDEs)
SOHO/MDI TRACE (171)
100 arcsec
Phase 4: more LDE flares• 2005/09/13 19:19UT (X1.5)• 2005/09/13 23:30UT (X1.7)
near disc center
Site of Flares100 arcsec
Phase 4: Impulsive flares• 2005/09/13 19:19UT (X1.5)• 2005/09/13 23:30UT (X1.7)
on the -umbracompact regionNo-CMEs!
Summary of NOAA 10808
• showed complex structure (-type sunspots)• rapidly decay (in the second half of the path)• flare-productive AR (10 X-class, 20 M-class flare
s)
• both of LDE flares and impulsive flares occurred• sites are different• Halo-CMEs were associated with LDEs (even X-
class flares were not necessarily associated with CMEs)
• wide angle ejections/CMEseven limb flares generated Halo-CMEs
Questions
• Why are Halo-type CMEs generated even from near-limb flares?
Ejections are easily expanded?
• Homologous flares, but some of them are geo-effective (and others are no geo-effective)?
• Are big flares associated with big magnetic storms?
Flares ofNOAA 10798
Characteristics• AR is located near t
he southwest limb• But, generated Hal
o-CMEs
ejection が広がりやすい磁場構造 !?
Confined Flares
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