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