Analysis of NOAO AR 11092 and 11093 using HMI and GONG data

Sushant C. Tripathy

GONG, NSO

Introduction

• We study the evolution of two AR NOAO 11092 (July 30 – Aug 7, 2010) and 11093 (August 6 – 14, 2010) during its disk passage.

• GONG and HMI data are processed mostly through the GONG ring-diagram pipeline

• We will compare the flows and sound speed differences between the two AR’s.

8/18/2011 2Analysis of AR 11093 and 11092

Continuum Magnetogram

2010.08.11_03:45

2010.08.13_13:458/18/2011 3Analysis of AR 11093 and 11092

Doppler

AR 11092 and two quiet tiles

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MAI: 0.82 30.23 0.89

Properties of AR 11092

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AR 92 (Lat 12.5⁰) Location (CMD) MAI

100730 (Day 1) - 53.0: 36.4

100731 - 39.8: 37.0

100801 - 26.5: 30.3

100802 - 13.3: 28.3

100803 (day 5) 00.0 30.2

100804 13.3: 33.5

100805 26.5: 32.6

100806 39.8: 32.1

100807 (Day 9) 53.0: 31.3

Properties of AR 11093

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AR 93 (Lat 10⁰) CMD MAI

100806 (Day 1) -47.5: 32.0

100807 -34.2: 32.3

100808 -21.0: 23.9

100809 -7.5: 22.8

100810 (Day 5) 5.5: 27.6

100811 19.0: 24.1

100812 32.0: 18.9

100813 45.3: 22.0

100814 (Day 9) 58.5: 14.3

Quiet 1 +35.0 1.0

Quiet 2 -42.5 0.99

Notes on GONG R-D pipeline

• uses Symmetric Lorentzian model profile to fit the power spectrum

• Normally fits up to radial order n = 6 but we have extended it up to n = 9

• Uses the new guess table from Deborah to be consistent with HMI pipeline

8/18/2011 7Analysis of AR 11093 and 11092

The diagnostic diagram

HMIGONG

HMI VHMI I

No of modes fitted: HMI 15: (384x384 pixels): 400 (320)HMI 5: (128x128 pixels): 60 (40)GONG 15: (128x128 pixels): 320 (200)

8/18/2011 8Analysis of AR 11093 and 11092

5 deg

Variation of zonal component of velocity (HMI 15:)

8/18/2011 9Analysis of AR 11093 and 11092

Variation of meridional component(HMI 15:)

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Variation of zonal and meridionalcomponent of velocity (GONG 15:)

8/18/2011 11Analysis of AR 11093 and 11092

Comparison between AR 11092 and 11093

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The flow varies on a daily basisand in general, increases with depth.

The flows are similar for the two AR’s.

CM

Comparison between AR 11092 and 11093

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The y-component of the flow varies on a daily basis and are different for the two AR’s.

The implication is not known.

CM

Day 3

Day 89392

Comparison between ARs

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The x-component of the flow between the two active regions is more similar than the y-component and is consistent between the HMI and GONG observations.

Flow maps using GONG data

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AR 11093

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AR 11093

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AR 11093

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Frequency Differences (AR – Q)

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Frequency Differences (AR – Q)

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The regions are tracked at Carrington rate for a period of 3456 minutes.

Comparison between GONG and HMI

HMI frequencies are higher than the GONG frequencies

An effect of line formation height/different spectral line? 8/18/2011 21Analysis of AR 11093 and 11092

Sound speed inversion

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The inversion is performed using SOLA inversion code. Courtesy of C. Baldner.

There is a day-to-day variation in sound speed profile .

Average Sound speed profile

8/18/2011 Analysis of AR 11093 and 11092 23The inversion for AR 11251 is performed using SOLA inversion code. Courtesy of S. Basu.

We now have a more consistent picture and the characteristic two-layer sound speed structure can be clearly seen (negative in outer layers and positive at larger depths).

But there are differences in detail.

Sound-speed inversions for AR 11092 relative to targ[11092+47.5][2099][030.0][+15.0] (red)targ[11092-47.5][2099][125.0][+15.0] (blue)AR9787 (green) + two AR of Bogart et al

The sound speed profile for AR 11092 (red curve) is

consistent between the two inversions.

Koshovichev et al.

Summary

The x-component of the horizontal flows are similar while the y-component is different between the two ARs. The implication is not clear.

The sound speed profiles of the two active regions is consistent and also agrees with those obtained by Kosovichev et al for the same pair of active and quiet regions.

Frequency calculated from HMI data are higher than those obtained from GONG observations (height dependency ? Different spectral line ?)

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Thank You

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