Nobeyama Radioheliograph Event 19990816_2231


EventID : 19990816_2231
Keyword : sigmoid AR
Observer : KH
Start : 1999-08-16 22:31:25
End : 1999-08-17 06:21:25
Position: N20E39
Maximum Correlation @17GHz (x10^-4) : --
Maximum Brightness Temperature @17GHz : --
GOES: B9.5 (0318-0334-0347)
NOAA Number: 8668


Moving microwave sources in AR8663 along backward-S filament.

The brightest source (sunspot at the center) is R polarized.

FOV of the box is 314" x 314".


Time evolution of the maximum Tb in the box.
The solid line shows Max (R+L) and the dotted line shows Max (R-L).
Data points are plotted every 10 min.


Stokes I (R+L) map in the box on 17 Aug. The brightness is normalized to the maximum Tb in each image.
Java movie of the box region (10 min. interval)


H alpha image around the spot taken at01:13:04UT on August 17, 1999. (CRL/Hiraiso)


The sigmoid AR on the previous day (1999 Aug. 15-16).

A weak activity was observed along the backward-S filament.