April 28th, 2011 Solar Update, C-Flares

C-Flares / Solar Update
04/28/2011 by Kevin VE3EN at 12:00 UTC
Comment on Message Board

Solar Update - Sunspot 1199 did show some growth early on Thursday and this region is now producing B-Class and lower level C-Class flares. Continue to monitor this area for further development.

A sunspot is rotating into view on the eastern limb and is probably the return of an older region.

A few other locations as circled in the image below are trying to produce sunspots as well.

Visible Solar Disk (Thursday) - SDO

Eastern Limb Sunspot (Thursday) - SDO

:Solar_Region_Summary: 2011 Apr 27

# Region Location Sunspot Characteristics

# Helio Spot Spot Mag.

# Num Lat.,CMD Long. Area Extent class count class

1195 S17W38 191 230 10 DHO 7 B

1199 N21W34 187 120 7 DAI 12 B

A - Alpha (single polarity spot).

B - Beta (bipolar spot configuration).

G - Gamma (atypical mixture of polarities).

BG - Beta-Gamma (mixture of polarities in a dominantly bipolar configuration).

D - Delta (opposite polarity umbrae within single penumbra).

BD - Beta with a Delta configuration.

BGD - Beta-Gamma with a Delta configuration.

Prepared jointly by the U.S. Dept. of Commerce, NOAA,

Space Weather Prediction Center and the U.S. Air Force.

Updated 2011 Apr 27 2200 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 117 Issued at 2200Z on 27 Apr 2011

IA. Analysis of Solar Active Regions and Activity from 26/2100Z

to 27/2100Z: Solar activity has been at low levels for the past 24

hours. New Region 1201 (N16E40), grew rapidly early in the period,

producing a C2 flare at 27/0301Z with a non-Earth directed CME. A

Type II radio sweep, with a shock velocity of 845 km/s, was also

associated with this event. Region 1201 has since decayed and is

now spotless plage. A second, back-sided CME, first visible in

LASCO C2 imagery at 27/0800Z, was also observed during the period.

Neither CME is expected to become geoeffective. Region 1199 (N21W34)

continues to grow and evolve.

IB. Solar Activity Forecast: Solar activity is expected to be at

very low to low levels for the next three days (28-30 April).

IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z:

The geomagnetic field has been at quiet levels for the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is

expected to be at predominantly quiet levels for the next 2 days

(28-29 April). Unsettled to active levels are expected on day three

(30 April) as a recurrent coronal hole high-speed stream becomes

geoeffective.

III. Event Probabilities 28 Apr-30 Apr

Class M 05/05/05

Class X 01/01/01

Proton 01/01/01

PCAF green

Source: Kevin 

http://www.solarham.com/

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