[Ips-dsgr] SWS Daily Report - 22 April 20 issued 2331 UT on 22 Apr 2020

Regional Warning Centre rwc at ips.gov.au
Thu Apr 23 09:31:26 EST 2020


SUBJ: SWS DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/22 APRIL 2020 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
SUMMARY FOR 22 APRIL AND FORECAST FOR 23 APRIL - 25 APRIL
STATUS INDICATORS SOL:GREEN   MAG:GREEN     ION: GREEN
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 22 Apr:  Very low

Flares: none.

Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Apr:  71/6


1B. SOLAR FORECAST
             23 Apr             24 Apr             25 Apr
Activity     Very low           Very low           Very low
Fadeouts     None expected      None expected      None expected
10.7cm/SSN    71/6               71/6               71/6

COMMENT: Solar activity was very low on UT day, 22 April. Very 
low levels of solar activity are expected for the next three 
UT days, 23-25 April. The visible disc has been spotless and 
there are no returning regions expected. No Earth bound CMEs 
observed in available LASCO and STEREO images. During UT day 
22 April, the solar wind speed was above 500 km/s for some time 
in the early hours, then stayed relatively steady above 450 km/s 
from around 0500 UT to 1700 UT, and then gradually decreased 
to nearly 430 km/s. The total IMF (Bt) gradually decreased from 
5 nT to 3 nT. The north-south IMF component (Bz) stayed mostly 
in the range +3/-5 nT. The solar wind particle density varied 
between 3 ppcc and 7 ppcc. These observations seem consistent 
with the previously anticipated coronal hole effects. Solar wind 
parameters may show minor to moderate strengthening on UT day 
23 April due to coronal hole effects and then decline to more 
nominal values on 24 and 25 April.

-----------------------------------------------------------
2A. MAGNETIC SUMMARY

Geomagnetic field for Australian Region 22 Apr: Quiet to Unsettled

Estimated Indices 22 Apr : A   K           
   Australian Region       4   11113101
      Darwin               3   11112101
      Townsville           4   21113101
      Learmonth            5   21113111
      Alice Springs        3   11103101
      Gingin               4   21013111
      Canberra             1   11001000
      Hobart               4   11103111    

Estimated Antarctic Regional K Indices 22 Apr :
      Macquarie Island     3   21013000
      Casey                6   32212111
      Mawson              20   54222235

Observed Regional daily pc3 Indices 22 Apr : 
      Darwin               0   (Quiet)
      Townsville           0   (Quiet)
      Learmonth            0   (Quiet)
      Alice Springs        0   (Quiet)
      Gingin               2   (Quiet)
      Canberra             0   (Quiet)
      Melbourne           NA

Pc3 pulsations are high frequency (10-45 second period) variations 
of the Earths magnetic field. Daily pc3-indices are the daily sum 
of 20 minute pc3-indices for that station and have been shown to be
well correlated with rejection of high resolution aeromagnetic
survey flight-line data. 

NOTE: Indices may have been generated from data obtained in 
cooperation with the following organisations: Geoscience Australia, 
University of Newcastle Space Physics Group, Australian Government 
Antarctic Division and International Center for Space Weather 
Science and Education, Japan.


Estimated AFr/Ap Indices 22 Apr : A 
           Fredericksburg         7
           Planetary              8                         

Observed AFr/Ap Indices 21 Apr :  A   K
           Fredericksburg         8
           Planetary              9   1202 332NA      


2B. MAGNETIC FORECAST 
Date      Ap    Conditions
23 Apr    10    Quiet to Unsettled
24 Apr     6    Quiet
25 Apr     6    Quiet

COMMENT: On UT day 22 April, the geomagnetic conditions in the 
Australian and Antarctic regions varied mostly from quiet to 
unsettled levels. Short periods of isolated minor storm were 
also recorded in the Antarctic region. Global geomagnetic conditions 
may vary from quiet to unsettled levels on UT day 23 April and 
stay mostly quiet on 24 and 25 April.

-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
	            Latitude Band
Date        Low            Middle         High 
22 Apr      Normal         Normal         Normal         

PCA Event : No event.

3B. GLOBAL HF PROPAGATION FORECAST
	            Latitude Band
Date        Low            Middle         High 
23 Apr      Normal         Normal         Normal
24 Apr      Normal         Normal         Normal
25 Apr      Normal         Normal         Normal

COMMENT: Maximum usable frequencies (MUFs) were near predicted 
monthly values with periods of minor to significant enhancements 
on UT day, 22 April. Mostly normal HF conditions may be expected 
for the next three UT days, 23 to 25 April.

-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY


Date   T index
22 Apr    -1

Observed Australian Regional MUFs
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 50% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

Monthly T index:
Month  T index
Mar      1
Apr      -14
May      -14

4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date   T index  MUFs
23 Apr     0    Near predicted monthly values
24 Apr     4    Near predicted monthly values
25 Apr     4    Near predicted monthly values

COMMENT: Maximum usable frequencies (MUFs) were near predicted 
monthly values with periods of minor to significant enhancements 
for the Australian region on UT day, 22 April. Mostly normal 
HF conditions may be expected in the Australian regions for the 
next three UT days, 23 to 25 April.

-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY

GOES satellite data for 21 Apr
       Daily Proton Fluence >1 MeV:   9.2E+04
       Daily Proton Fluence >10 MeV:  4.6E+04
       Daily Electron Fluence >2 MeV: 1.20E+06   (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 1%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
       X-ray background: <A1.0

DSCOVR Satellite Solar Wind Day Averaged Data for 21 Apr
Speed: 367 km/sec  Density:    7.3 p/cc  Temp:   112000 K  Bz:   0 nT

(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

IMPORTANT: This e-mail, including any attachments, may contain,
confidential or copyright information.  The views expressed in 
this message are those of the individual sender, unless 
specifically stated to be the views of SWS.  If you are not 
the intended recipient, please contact the sender immediately 
and delete all copies of this e-mail and attachments. 
To unsubscribe from an IPS mail list either send an email to 
"MAIL_LIST"-leave at ips.gov.au or go to
http://www.sws.bom.gov.au/mailman/listinfo/"MAIL_LIST".
Information about training can be obtained from
http://www.sws.bom.gov.au/mailman/listinfo/ips-training.
General information is available from
http://www.sws.bom.gov.au/mailman/listinfo/ips-info.




More information about the ips-dsgr mailing list