FEEDBACK

NASA GSFC Space Weather Center

NASA GSFC Space Weather Center

Weekly Space Weather Summary Report for August 3, 2011 - August 9, 2011

 From: GSFC-Space-Weather-Desk 
 Date: August 10, 2011 5:54:33 PM EDT
 To: GSFC-Space-Weather-Desk 
 Subject: Weekly Space Weather Report

 ## Message Type: Weekly Space Weather Summary Report for August 3, 2011 - August 9, 2011
 ##
 ## Message Issue Date:           2011-08-10T21:50:00Z
 ## Report Coverage Begin Date:   2011-08-03T00:00:00Z
 ## Report Coverage End   Date:   2011-08-09T23:59:59Z
 ## Message ID: 20110810-7D-001


 ## Summary:

Solar activity ranged from low, moderate to high levels for this reporting period with occurrence of numerous C-class flares, a few long-duration M-class flares accompanied by significant CMEs (see the alerts 20110803-AL-002 and 20110804-AL-003), and an X6.9 class flare (the largest flare of the solar cycle 24 so far) peaked at 2011-08-09T08:05Z (details are listed below). Most of the flares originated from the active regions 1261 and 1263.

A weak interplanetary shock arrived at ACE (L1) around 2011-08-04T21:00Z due to the CME occurred on 2011-08-02 (see the alert 20110805-AL-001). A stronger interplanetary shock registered at ACE around 2011-08-05T17:20Z from the merged two CMEs initiated on 2011-08-03 and on 2011-08-04 respectively (see below).

In terms of geomagnetic activity, a brief period of severe level of geomagnetic disturbances resulted from the arrival of the merged CMEs (the strong shock mentioned above) during 2011-08-05T18:00 - 2011-08-05T21:00Z where Kp = 8 (Kp ranges from 0 -9). The geomagnetic activity decreased back to low levels (Kp=3) by the mid-day (12:00 UT) on 2011-08-06. Otherwise, geomagnetic activity was low in general (Kp <= 3).

The >0.8 MeV energetic electron flux at GEO started at high levels (> 10^4 pfu) until 2011-08-05T00:00Z, decreased to low levels due to the arrival of the interplanetary shocks (from 2011-08-05T00:00Z to 2011-08-07T00:00Z) and recovered back to be at high levels for the remainder of the reporting week (at times close to 10^5 pfu).

There were two instances of energetic proton events during the reporting week. 1. The >100 MeV proton flux at GEO orbit exceeded 1 pfu during the period of 2011-08-04T05:10Z to 2011-08-04T11:10Z, peaking at 1.8 pfu at 2011-08-04T07:40Z. The > 10 MeV proton flux at GEO orbit exceeded 10 pfu beginning at 2011-08-04T06:35Z, reaching maximum of 96 pfu at 2011-08-05T21:50Z, and ending at 2011-08-06T05:15Z. The >10 MeV proton flux decreased towards the background level on 2011-08-07. This resulted from the M9.3 flare and the associated CME on 2011-08-04.

2. The >100 MeV proton flux at GEO orbit exceeded 1 pfu during the period of 2011-08-09T08:25Z to 2011-08-09T10:45Z, peaking at 2.7 pfu at 2011-08-09T08:55Z. The > 10 MeV proton flux at GEO orbit exceeded 10 pfu beginning at 2011-08-09T08:45Z, reaching maximum of 27 pfu at 2011-08-09T12:10Z, and ending at 2011-08-09T17:10Z. The >10 MeV proton flux decreased towards the background level on 2011-08-10. This resulted from the X6.9 flare and the associated CME on 2011-08-09.

 Space weather impact:
 Spacecraft between the Sun and Earth can be impacted during the periods of the space weather events.

 ## Events:
 Flares (C class and above):
 Date           Start          Stop          Peak          Class          Location
 2011/08/03    02:35:00       02:40:00      02:38:00       C1.2           N16W25 (Region 1261)
 2011/08/03    03:08:00       03:51:00      03:37:00       M1.1           N15W28 (Region 1261)
 2011/08/03    04:29:00       04:35:00      04:32:00       M1.7           N16E10 (Region 1263)
 2011/08/03    06:42:00       06:49:00      06:46:00       C1.1           N19W24 (Region 1261)
 2011/08/03    07:38:00       07:46:00      07:45:00       C3.0           N15W28 (Region 1261)
 2011/08/03    10:01:00       10:06:00      10:04:00       C1.0           N15E05 (Region 1263)
 2011/08/03    13:17:00       14:30:00      13:45:00       M6.0           N17W30 (Region 1261)
 2011/08/03    18:52:00       19:06:00      19:00:00       C2.3           N15W00 (Region 1263)
 2011/08/03    19:23:00       19:30:00      19:30:00       C8.5           N14W36 (Region 1261)
 2011/08/04    00:47:00       00:50:00      00:50:00       C1.6           N14W37 (Region 1261)
 2011/08/04    02:14:00       02:28:00      02:15:00       C3.2           N15W39 (Region 1261)
 2011/08/04    03:41:00       03:57:00      03:45:00       M9.3           N16W38 (Region 1261)
 2011/08/04    07:56:00       08:06:00      08:00:00       C3.5           N16W08 (Region 1263)
 2011/08/04    09:15:00       09:23:00      09:20:00       C2.5           N19W39 (Region 1261)
 2011/08/04    10:06:00       10:19:00      10:12:00       C1.6           N14W41 (Region 1261)
 2011/08/04    11:43:00       11:49:00      11:45:00       C1.2           N15W44 (Region 1261)
 2011/08/04    13:04:00       13:12:00      13:07:00       C2.1           N16W09 (Region 1263)
 2011/08/04    14:09:00       14:17:00      14:15:00       C1.0           N14W44 (Region 1261)
 2011/08/04    14:32:00       14:44:00      14:38:00       C1.8           N16W10 (Region 1263)
 2011/08/04    21:07:00       21:15:00      21:15:00       C3.2           N14W49 (Region 1261)
 2011/08/04    22:03:00       22:13:00      22:08:00       C1.2           N16W15 (Region 1263)
 2011/08/04    22:54:00       23:05:00      23:00:00       C1.7           N15W51 (Region 1261)
 2011/08/04    23:21:00       23:32:00      23:28:00       C3.6           N14W50 (Region 1261)
 2011/08/05    03:32:00       03:41:00      03:41:00       C1.0           N15W80 (Region 1265)
 2011/08/05    05:56:00       06:07:00      05:59:00       C1.3           N18W50 (Region 1261)
 2011/08/05    10:23:00       10:37:00      10:30:00       C1.0           N15W56 (Region 1261)
 2011/08/05    12:38:00       12:45:00      12:45:00       C2.0           N19W24 (Region 1263)
 2011/08/05    17:40:00       17:53:00      17:47:00       C1.8           N18W26 (Region 1263)
 2011/08/05    19:41:00       19:49:00      19:45:00       C1.4           N16W63 (Region 1261)
 2011/08/06    11:41:00       11:53:00      11:46:00       C1.3           N18W29 (Region 1263)
 2011/08/06    12:16:00       12:30:00      12:23:00       C1.4           S16E19 (Region 1267)
 2011/08/06    16:55:00       18:41:00      18:07:00       C1.4           N25W87 (Region 1260)
 2011/08/06    19:22:00       19:32:00      19:27:00       C1.4           N17W34 (Region 1263)
 2011/08/06    22:23:00       23:15:00      22:46:00       C1.4           N17W35 (Region 1263)
 2011/08/07    02:12:00       02:22:00      02:15:00       C1.3           N17W38 (Region 1263)
 2011/08/07    03:04:00       03:24:00      03:11:00       C2.1           N17W38 (Region 1263)
 2011/08/07    03:38:00       03:48:00      03:43:00       C1.4           N18W43 (Region 1263)
 2011/08/07    04:04:00       04:11:00      04:08:00       C1.6           N17W39 (Region 1263)
 2011/08/07    08:24:00       08:37:00      08:32:00       C1.6           S16E08 (Region 1267)
 2011/08/07    09:23:00       09:29:00      09:27:00       C2.1           N18W45 (Region 1263)
 2011/08/07    14:02:00       14:10:00      14:06:00       C1.3           N18W46 (Region 1263)
 2011/08/08    03:00:00       03:14:00      03:10:00       C1.3           N18W58 (Region 1263)
 2011/08/08    16:30:00       16:41:00      16:36:00       C2.2           N17W62 (Region 1263)
 2011/08/08    18:00:00       18:10:00      18:18:00       M3.5           N15W62 (Region 1263)
 2011/08/08    22:00:00       22:20:00      22:09:00       C7.7           N17W65 (Region 1263)
 2011/08/08    23:02:00       23:22:00      23:15:00       C5.3           N17W66 (Region 1263)
 2011/08/09    03:19:00       03:54:00      03:45:00       M2.5           N17W69 (Region 1263)
 2011/08/09    07:19:00       07:27:00      07:23:00       C1.4           N15W69 (Region 1263)
 2011/08/09    07:48:00       08:08:00      08:05:00       X6.9           N14W69 (Region 1263)
 2011/08/09    13:29:00       13:45:00      13:45:00       C2.2           N17W78 (Region 1263)
 2011/08/09    15:43:00       15:54:00      15:45:00       C2.4           N15W76 (Region 1263)
 2011/08/09    18:04:00       18:11:00      18:11:00       C2.0           N16W75 (Region 1263)
 2011/08/09    23:33:00       23:49:00      23:43:00       C3.9           N15W80 (Region 1263)


 CMEs (> 500 km/s):
 Earth directed:
 Starting time        Speed (km/s)       Direction (LON/LAT in HEE)     Angular width (degrees)      Detecting spacecraft (real-time)
 2011-08-03T13:55Z     ~ 1320                   30/15                          88                          STEREO A, B and SOHO
 2011-08-04T04:10Z     ~ 1950                   40/14                          120                         STEREO A, B and SOHO

 Non-Earth directed:
 Starting time        Speed (km/s)       Direction (LON/LAT in HEE)     Angular width (degrees)      Detecting spacecraft (real-time)
 2011-08-08T18:24Z     ~ 850                      60/0                            40                          STEREO A, B and SOHO
 2011-08-09T08:24Z      ~ 1175                   62/-12                         40                          STEREO A, B and SOHO

 ## Spacecraft Anomalies Reported to SWL:
 None.

 ## Space Weather Outlook:
 ## Outlook Coverage Begin Date: 2011-08-10T00:00:00Z
 ## Outlook Coverage End   Date: 2011-08-16T23:59:59Z

The active region 1263 (N17W90), now at the west limb, remains magnetically complex, having the potential of giving off M-class flares and backsided CMEs in the upcoming week. The radiation belt electron flux is expected to remain at high levels for the first half of the week.

 ## Notes:


 For questions, comments, requests etc. contact:
 GSFC-Space-Weather-Desk 
 Y. Zheng, 301-286-0111 (office)  240-381-5237 (cell)
 A. Pulkkinen, 301-286-0652 (office), 240-381-0968 (cell)

NASA GSFC Space Weather Laboratory provides information about space environment conditions using state-of-the-art observational as well as model/simulation data. Certain products are derived from combinations of existing data sets as well as the output from coupled models or model chains. Consequently, it is important to note that space weather products may be in experimental or evaluation phases of development or deemed science quality only. Space environment Information provided by the NASA GSFC Space Weather Laboratory is .as is. and users assume all risks related to its use and interpretation. NASA, model developers, and all data resource providers disclaim any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NASA, model developers, and any data resource provider be liable to you or to any third party for any direct, indirect, incidental, consequential, special or exemplary damages or lost profit resulting from any use or misuse of this information.



CCMC Links
NASA Logo, National Aeronautics and Space Administration