Nobeyama Radioheliograph Event 19990404_0521

EventID : 19990404_0521
Keyword : Flare
Start : 1999-04-04T05:16:56.000Z
Peak : 1999-04-04T05:21:26.000Z
End : 1999-04-04T06:04:50.000Z
Position: N17E68
X (arcsec) : -859
Y (arcsec) : 334
Maximum Correlation @17GHz (x10^-4) : 889
Maximum Brightness Temperature @17GHz : 1.8e+07
Area_src/Area_beam @17GHz : 4.7
Maximum flux @17GHz (SFU) : 228
Maximum flux @34GHz (SFU) : 98
Number of Impulsive fluctuation : 190
GOES: M5.4
NOAA Number: 8508
Yohkoh HXT (L,M1,M2,H): (,,,)

(top panel) GOES plot.
(bottom panel) NoRH 17/34 GHz correlation plot; (white line) 17 GHz (yellow line) 34 GHz .

Full sun 17GHz image. The flare region is indicated by the solid box.


Partial 17/34GHz images. Color map shows brightness temperature, contour shows 17GHz (r-l)/(r+l) levels, where 'r' and 'l' indicates right- and left-handed circularly-polarized components, respectively. Field of View is 314. x 314. arcsec
Contour levels of the thick lines are (r-l)/(r+l)=-0.1,-0.2,.. and those of the thin lines are (r-l)/(r+l)= +0.1,+0.2,...
Orange circle at top-left indicates the half-max. beam size

(top) NoRH 17/34 GHz correlation plot; Diamonds indicate the data points of event mode (50ms/100ms cadence): (white line) 17 GHz (yellow line) 34 GHz .
(bottom) Temporal derivative of correlation plot. Unit is (s^-1). Dotted line indicate 1 %/sec boundary.

50/100ms movie