37 citations · 130 across the 8 of their papers we have counts for
8 papers
Active regions and the large-scale magnetic field of solar cycle 24
Ismo Tähtinen, Timo Asikainen, Kalevi Mursula
Most of the intracyclic variability in the large-scale solar magnetic field comes from the equatorial dipole component of the solar magnetic field. The equatorial dipole component…
Reconstructing solar magnetic fields from historical observations X. Effect of magnetic field inclination and boundary structure on AIA 1600 Å emission
Ismo Tähtinen, Alexei A. Pevtsov, Timo Asikainen +1
The relation between the intensity of chromospheric emissions and the photospheric magnetic field strength has been examined in several studies, but the effect of the magnetic fiel…
Straight outta photosphere: Open solar flux without coronal modeling
Ismo Tähtinen, Timo Asikainen, Kalevi Mursula
The open solar flux, that is, the total magnetic flux escaping the Sun, is one of the most important parameters connecting solar activity to the Earth. The open solar flux is commo…
Transition to a weaker Sun: Changes in the solar atmosphere during the decay of the Modern Maximum
K. Mursula, A. A. Pevtsov, T. Asikainen +2
The Sun experienced a period of unprecedented activity during the 20th century, now called the Modern Maximum (MM). The decay of the MM after cycle 19 has changed the Sun, the heli…
Magnetic storms during the space age: Occurrence and relation to varying solar activity
Kalevi Mursula, Timo Qvick, Lauri Holappa +1
We study the occurrence of magnetic storms in space age (1957-2021) using Dst and Dxt indices. We find 2526/2743 magnetic storms in the Dxt/Dst index, out of which 45% are weak, 40…
New Homogeneous Dataset of Solar EUV synoptic maps from SOHO/EIT and SDO/AIA
Amr Hamada, Timo Asikainen, Kalevi Mursula
Synoptic maps of solar EUV intensities have been constructed for many decades in order to display the distribution of the different EUV emissions across the solar surface, with eac…
FORESAIL-1 cubesat mission to measure radiation belt losses and demonstrate de-orbiting
FORESAIL collaboration, M. Palmroth, J. Praks +57
Today, the near-Earth space is facing a paradigm change as the number of new spacecraft is literally sky-rocketing. Increasing numbers of small satellites threaten the sustainable…
Automated identification of coronal holes from synoptic EUV maps
Amr Hamada, Timo Asikainen, Ilpo Virtanen +1
Coronal holes (CH) are regions of open magnetic field lines in the solar corona and the source of fast solar wind. Understanding the evolution of coronal holes is critical for sola…