Activities per year
Abstract
Changes in radiocarbon in terrestrial archives partly reflect changes in the solar magnetic activity, as variations in
the Sun’s magnetic field modulate the shielding of Earth from cosmic rays. By analyzing annual radiocarbon measurements
in tree rings from several pieces of oak from Jutland, Denmark, covering the Spörer Grand Solar Minimum
from 1450 to 1550 AD we aim to unravel rapid changes in solar activity across this time period. We compare the
new high-resolution 14C record with existing 14C records, including the IntCal13 data (Reimer et al., 2013), and we
identify cyclicities associated with changes in solar activity. We demonstrate how the nature of the short ~11-year
solar cycle, known as the Schwabe cycle, changed during the Spörer Minimum, i.e. a long-term period of reduced
solar magnetic activity.
Annual radiocarbon measurements furthermore allow the identification and study of cosmic-ray events, so-called
Miyake Events, which are thought to have a solar origin. These events are characterized by rapid increases in radiocarbon
over 1-2 years. We have measured the radiocarbon fraction annually and for some years sub-annually, in
several pieces of Danish oak covering the two Miyake Events in 775 AD and 994 AD, and here we show our results
and compare them to the other published records.
the Sun’s magnetic field modulate the shielding of Earth from cosmic rays. By analyzing annual radiocarbon measurements
in tree rings from several pieces of oak from Jutland, Denmark, covering the Spörer Grand Solar Minimum
from 1450 to 1550 AD we aim to unravel rapid changes in solar activity across this time period. We compare the
new high-resolution 14C record with existing 14C records, including the IntCal13 data (Reimer et al., 2013), and we
identify cyclicities associated with changes in solar activity. We demonstrate how the nature of the short ~11-year
solar cycle, known as the Schwabe cycle, changed during the Spörer Minimum, i.e. a long-term period of reduced
solar magnetic activity.
Annual radiocarbon measurements furthermore allow the identification and study of cosmic-ray events, so-called
Miyake Events, which are thought to have a solar origin. These events are characterized by rapid increases in radiocarbon
over 1-2 years. We have measured the radiocarbon fraction annually and for some years sub-annually, in
several pieces of Danish oak covering the two Miyake Events in 775 AD and 994 AD, and here we show our results
and compare them to the other published records.
| Translated title of the contribution | En bedre forståelse af solens magnetiske aktivitet gennem årlige kulstof-14 målinger i træringe |
|---|---|
| Original language | English |
| Publication date | 20 Jun 2018 |
| Publication status | Published - 20 Jun 2018 |
| Event | The 23rd International Radiocarbon Conference - Scandic Lerkendal, Trondheim, Norway Duration: 17 Jun 2018 → 22 Jun 2018 |
Conference
| Conference | The 23rd International Radiocarbon Conference |
|---|---|
| Location | Scandic Lerkendal |
| Country/Territory | Norway |
| City | Trondheim |
| Period | 17/06/2018 → 22/06/2018 |
Activities
- 2 Participation in or organisation af a conference
-
The 23rd International Radiocarbon Conference
Fogtmann-Schulz, A. (Participant)
20 Jun 2018Activity: Participating in or organising an event types › Participation in or organisation af a conference
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The 23rd International Radiocarbon Conference
Philippsen, B. (Participant) & Schou, M. F. (Participant)
17 Jun 2018 → 22 Jun 2018Activity: Participating in or organising an event types › Participation in or organisation af a conference