Detailed Information

Solar Activity

Solar activity in the past 24 hours was eruptive.

There were four C-class flares that occurred in the past 24 hours. The strongest was a C9.9 flare, which peaked at 09:53 UT from an unknown region on the farside of the eastern limb. One type II and one type III solar radio bursts, as well as six CMEs were observed during this period. The east-directed CMEs had the highest median velocity of 1739 km/s and an angular width of 16°, while the west-directed CMEs had the highest median velocity of 447 km/s and an angular width of 58°. The latest SDO/HMI intensitygram data show four active regions (NOAA 14284, 14285, 14286, and 14287), while the latest BBSO H-alpha data show three H-alpha plages (NOAA 14279, 14280, and 14283) on the solar disk. The GONG Calibrated Farside Map indicates that no new active regions are expected to appear on the solar limb in the next 24 hours.

Based on today's conditions, solar activity for the next 24 hours is predicted to be eruptive.

Geomagnetic Activity

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

The solar wind speed decreased from 586 km/s to 379 km/s, while the north-south component of the interplanetary magnetic field fluctuated between -3.9 nT and 4.3 nT. There were geoeffective coronal holes at the south pole and central equator, while the others at the northwest, eastern equator, north pole, and northeast were not geoeffective. The CME that occurred on 19 November at 14:24 UT mainly erupted toward the southwest had a speed of 331 km/s and an angular width of 10°. It was geoeffective and is likely to have no impact in the next 24 hours.

A quiet level of geomagnetic activity is expected for the next 24 hours.

Ionospheric Activity

The ionospheric activity for the last 24 hours cannot be evaluated due to unavailable data observation. In the last 24 hours, the S4 index values (condition of ionospheric scintillation) were lower than 0.5, and the maximum TEC index value was at 73.05, both over Pontianak. The ionosphere activity on the next 24 hours is predicted to be Quiet.

Navigation

Based on TEC variation 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 on the next 24 hours is predicted on normal level.

HF Radio Communication

The MUF depression and Short Wave Fadeout (SWF) for the last 24 hours cannot be evaluated due to unavailable data observation.

 

The MUF depression on the next 24 hours is predicted in Quiet level due to previous of geomagnetic activity.

 

The SWF for the next 24 hours is predicted in Quiet level due to the prediction of the solar flare.

 

Satellites

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

A low level of electron flux is expected for the next 24 hours.

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

Based on today's conditions, the flux of high-energy protons for the next 24 hours is predicted to be quiet.