Detailed Information

Solar Activity

Solar activity was Active in the last 24 hours.
There were 8 flares with 6 C-class flares and 2 M-class flares in the last 24 hours. The maximum flare class was M1.3 from NOAA 3638 peaked at 17:12UT. There were 11 solar radioburst all of which are type-III occurred in the last 24 hours. There was 6 CME event in the last 24 hours. 

The east-directed CME has the highest median velocity of 781 km/s with an angular width of 10 degrees and the west-directed CME has the highest median velocity of 289 km/s with an angular width of 20 degrees.

The latest SDO/HMI Intensitygram data shows 12 active regions (NOAA 3639,3643,3644,3645,3646,3647,3648,3652,3654,3655,3656,3657) and the latest BBSO H-Alpha data shows 3 H-Alpha plages (NOAA 3650,3651,3653). STEREO/EUVI observation shows 1 Regions Due to Return 26 Apr to 28 Apr from the east limb of the Solar disk.

Based on today's condition: 
Solar activity in 26th April at 04:00 UT to 27th April at 03:59 UT is predicted to be Active.
Solar activity in 27th April at 04:00 UT to 28th April at 03:59 UT is predicted to be Eruptive.
Solar activity in 28th April at 04:00 UT to 29th April at 03:59 UT is predicted to be Eruptive.

Geomagnetic Activity

The geomagnetic activity was on quiet level for the last 24 hours.

The solar wind speed fluctuate between 318 km/s and 422 km/s, north-south component of interplanetary magnetic field decrease from 4.8 nT to -0.7 nT. There were geoeffective coronal holes at western equator and central equator, while the others at eastern equator, south-east, north-east and north-west were not geoeffective. CME on 25 April 2024 17:36 UT was mainly errupted toward south-west with speed of 222 km/s and angular width of 62°. The CME was geoeffective and is likely to have not impact until next 3 days.

Active level geomagnetic activity is expected for the next 24 hours.
Quiet level geomagnetic activity is expected for 27 April 2024 04UT - 28 April 2024 04UT.
Quiet level geomagnetic activity is expected for 28 April 2024 04UT - 29 April 2024 04UT.

Ionospheric Activity

Ionosphere was in Quiet for the last 24 hours.
There was no depression of foF2 lower than 30% of its median value. There was an increment of fmin more than 30% of its median values for 15 minutes and Spread-F appeared for 60 minutes. The Sporadic-E occurred in the night and daytime with foEs value exceeded the foF2 for 210 minutes. The S4 index values (condition of ionospheric scintillation ) reached 0.8 over Pontianak. The TEC index over Pontianak was 104.61 maximum and it has been at a Quiet level in the last 24 hours.

The ionosphere activity in April 26th, 04:00 UT - April 26th, 03:59 UT is predicted to be Quiet.  
The ionosphere activity in April 27th, 04:00 UT - April 28th, 03:59 UT is predicted to be Quiet. 
The ionosphere activity in April 28th, 04:00 UT - April 29th, 03:59 UT is predicted to be Quiet. 
 

Navigation

Based on TEC and scintilation , the error of the single frequency GPS positioning for the last 24 hours was in Normal level.

Based on ionospheric scintilation and TEC variation, the probability of error positioning in April 26th, 04:00 UT - April 26th, 03:59 UT is predicted at slight level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in April 27th, 04:00 UT - April 28th, 03:59 UT is predicted at slight level.
Based on ionospheric scintilation and TEC variation, the probability of error positioning in April 28th, 04:00 UT - April 29th, 03:59 UT is predicted at Normal level.

HF Radio Communication

MUF depression was in Quiet condition and Short Wave Fadeout (SWF) was in Quiet for the last 24 hours.

The MUF depression in April 26th, 04:00 UT - April 26th, 03:59 UT is predicted on Quiet level, based on LAPAN Time Series method. 
The MUF depression in April 27th, 04:00 UT - April 28th, 03:59 UT is predicted on Quiet level, due to previous of geomagnetic activity. 
The MUF depression in April 28th, 04:00 UT - April 29th, 03:59 UT is predicted on Quiet level, due to previous of geomagnetic activity.

The SWF in April 26th, 04:00 UT - April 26th, 03:59 UT is predicted in Minor level due to the prediction of solar flare.
The SWF in April 27th, 04:00 UT - April 28th, 03:59 UT is predicted in Quiet level due to the prediction of solar flare. 
The SWF in April 28th, 04:00 UT - April 29th, 03:59 UT is predicted in Quiet level due to the prediction of solar flare.
 

Satellites

The electron flux was on high level for the last 24 hours.

Low level of elektron flux is expected for the next 24 hours.
Low level of electron flux is expected for 27 April 2024 04UT - 28 April 2024 04UT
Low level of electron flux is expected for 28 April 2024 04UT - 29 April 2024 04UT

The flux of high-energy protons was in quiet for the last 24 hours.

Based on today's condition: 
the flux of high-energy protons in 26th April at 04:00 UT to 27th April at 03:59 UT is predicted to be Quiet.
the flux of high-energy protons in 27th April at 04:00 UT to 28th April at 03:59 UT is predicted to be Quiet
the flux of high-energy protons in 28th April at 04:00 UT to 29th April at 03:59 UT is predicted to be Quiet.