Detailed Information

Solar Activity

Solar activity in the past 24 hours was eruptive.

Nine C-class flares occurred in the past 24 hours. The strongest were C1.6 flare peaked at 15:58 UT from NOAA 14452. There were no solar radio bursts, while there were four west-directed CMEs observed during this period. The CMEs had the highest median velocity of 749 km/s and an angular width of 8°. The latest SDO/HMI intensitygram data show eight active regions (NOAA 14446, 14455, 14457, 14458, 14459, 14460, 14461, and 14462), while the latest BBSO H-alpha data show six H-alpha plages (NOAA 14448, 14449, 14450, 14451, 14454, and 14456) on the solar disk. Based on farside data, one new active region is expected to appear on the solar limb between 05 Jun and 07 Jun.

Based on today's conditions,

• solar activity for 05 June, 04:00 UT–06 June, 03:59 UT is predicted to be active;
• solar activity for 06 June, 04:00 UT–07 June, 03:59 UT is predicted to be eruptive;
• solar activity for 07 June, 04:00 UT–08 June, 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 increased from 349 km/s to 481 km/s, while the north-south component of the interplanetary magnetic field increased from -9.4 nT to 11.0 nT. There was one geoeffective coronal hole at the western equator, while the others at the southeast, eastern equator, and south pole were not geoeffective. The CME on 04 June 2026 at 04:12 UT was mainly erupted toward the west with the speed of 301 km/s and an angular width of 42°. The CME was geoeffective and is likely to have no impact until the next 3 days.

• A quiet level geomagnetic activity is expected for the next 24 hours;
• An active level geomagnetic activity is expected for 06 June, 04:00 UT–07 June, 03:59 UT;
• A quiet level geomagnetic activity is expected for 07 June, 04:00 UT–08 June, 03:59 UT.

Ionospheric Activity

Ionosfer was in minor condition for the last 24 hours.

There was a depression of foF2 lower than 30% of its median value for 45 minutes. There was an increment of fmin more than 30% of its median values for 60 minutes. There was no a Spread-F layer and the Sporadic-E for 1035 minutes in the night and daytime with foEs value exceeding the foF2 value. The S4 index values (condition of ionospheric scintillation) was less than 0.5 (quiet) and TEC index was less than 125 (quiet).

The ionosphere activity on June 5th, 04:00 UT - June 6th, 03:59 UT is predicted to be quiet.
The ionosphere activity on June 6th, 04:00 UT - June 7th, 03:59 UT is predicted to be minor.
The ionosphere activity on June 7th, 04:00 UT - June 8th, 03:59 UT is predicted to be quiet.

 

 

Navigation

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

Based on ionospheric scintillation and TEC variation, the probability of error positioning on June 5th, 04:00 UT - June 6th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on June 6th, 04:00 UT - June 7th, 03:59 UT is predicted at a normal level.
Based on ionospheric scintillation and TEC variation, the probability of error positioning on June 7th, 04:00 UT - June 8th, 03:59 UT is predicted at a normal level.

HF Radio Communication

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

The MUF depression on June 5th, 04:00 UT - June 6th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.
The MUF depression on June 6th, 04:00 UT - June 7th, 03:59 UT is predicted on a minor level, due to previous geomagnetic activity.
The MUF depression on June 7th, 04:00 UT - June 8th, 03:59 UT is predicted on a quiet level, due to previous geomagnetic activity.

The SWF on June 5th, 04:00 UT - June 6th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on June 6th, 04:00 UT - June 7th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.
The SWF on June 7th, 04:00 UT - June 8th, 03:59 UT is predicted at a quiet level due to the prediction of solar flare.

Satellites

The electron flux was at a low level for the last 24 hours.

• A low level of electron flux is expected for the next 24 hours;
• A low level of electron flux is expected for 06 June, 04:00 UT–07 June, 03:59 UT;
• A low level of electron flux is expected for 07 June, 04:00 UT–08 June, 03:59 UT.

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

Based on today's conditions, 

• the flux of high-energy proton for 05 June, 04:00 UT–06 June, 03:59 UT is predicted to be quiet;
• the flux of high-energy proton for 06 June, 04:00 UT–07 June, 03:59 UT is predicted to be quiet;
• the flux of high-energy proton for 07 June, 04:00 UT–08 June, 03:59 UT is predicted to be quiet.