scholarly journals Comparison of long-term variations of the cosmic ray flux from the network of ground-based detectors, PAMELA and AMS-02 data

2021 ◽  
pp. 15-22
Author(s):  
Anatoly V. Belov ◽  
Raisa T. Gushchina ◽  
Nataly Shlyk ◽  
Victor Yanke
Keyword(s):  
Cosmic Ray ◽  
Entire Period ◽  
Preliminary Results ◽  
Flux Measurements ◽  
Using Data ◽  
Cosmic Ray Flux ◽  
Long Term Variations ◽  
Good Agreement

The paper presents preliminary results of a comparison of long-term variations of the cosmic ray flux using data from the network of ground-based detectors with direct flux measurements on the PAMELA and AMS-02 magnetic spectrometers and a series of balloon stratospheric soundings. The analysis showed good agreement for the entire period of continuous ground-based monitoring of cosmic ray variations.

Long-term negative trend in cosmic ray flux

2000 ◽  
Vol 105 (A1) ◽  
pp. 9-17 ◽  
Author(s):  
Yuri I. Stozhkov ◽  
Peter E. Pokrevsky ◽  
Victor P. Okhlopkov
Keyword(s):  
Cosmic Ray ◽  
Negative Trend ◽  
Cosmic Ray Flux

scholarly journals Long term variations in the Extreme UV corona: the EIT/SoHO perspective

2001 ◽  
Vol 203 ◽  
pp. 501-504 ◽  
Author(s):  
J-F. Hochedez ◽  
F. Clette ◽  
E. Verwichte ◽  
D. Berghmans ◽  
P. Cugnon
Keyword(s):  
Extreme Ultraviolet ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Global View ◽  
Imaging Telescope ◽  
Extreme Uv ◽  
Long Term Variations

Since the start of the SoHO mission, EIT -the Extreme ultraviolet Imaging Telescope- offers a global view of the solar corona over the whole rising phase of the current activity cycle. Such a dataset is unprecedented. We give here the current results of an on-going investigation over the entire EIT archive. In the Fe XV images (2 MK), the on-disk and off-disk intensity distributions have been evaluated, and their evolution is described. Additionally, we developed an image processing technique that extracts the smallest detectable features. The cosmic ray hits are statistically disentangled from the solar point-like phenomena, and the trends in both rates are assessed.

In‐Orbit Performance of the Space Telescope NINA and Galactic Cosmic‐Ray Flux Measurements

2001 ◽  
Vol 132 (2) ◽  
pp. 365-375 ◽  
Author(s):  
V. Bidoli ◽  
A. Canestro ◽  
M. Casolino ◽  
M. P. De Pascale ◽  
G. Furano ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Space Telescope ◽  
Flux Measurements ◽  
Galactic Cosmic Ray ◽  
Cosmic Ray Flux

scholarly journals Climate change via CO2 drawdown from astrophysically initiated atmospheric ionization?

2020 ◽  
Vol 19 (5) ◽  
pp. 349-352 ◽  
Author(s):  
Adrian L. Melott ◽  
Brian C. Thomas ◽  
Brian D. Fields
Keyword(s):  
Climate Change ◽  
Opposite Sign ◽  
Stratospheric Ozone ◽  
Cosmic Ray ◽  
Ozone Layer Depletion ◽  
Ambiguous Result ◽  
Cosmic Ray Flux ◽  
Atmospheric Ionization ◽  
Fertilizer Effect

AbstractMotivated by the occurrence of a moderately nearby supernova near the beginning of the Pleistocene, possibly as part of a long-term series beginning in the Miocene, we investigated whether nitrate rainout resulting from the atmospheric ionization of enhanced cosmic ray flux could have, through its fertilizer effect, initiated carbon dioxide drawdown. Such a drawdown could possibly reduce the greenhouse effect and induce the climate change that led to the Pleistocene glaciations. We estimate that the nitrogen flux enhancement onto the surface from an event at 50 pc would be of order 10%, probably too small for dramatic changes. We estimate deposition of iron (another potential fertilizer) and find it is also too small to be significant. There are also competing effects of opposite sign, including muon irradiation and reduction in photosynthetic yield caused by UV increase from stratospheric ozone layer depletion, leading to an ambiguous result. However, if the atmospheric ionization induces a large increase in the frequency of lightning, as argued elsewhere, the amount of nitrate synthesis should be much larger, dominate over the other effects and induce the climate change. More work needs to be done to clarify the effects on lightning frequency.

scholarly journals The decrease in mid-stratospheric tropical ozone since 1991

2015 ◽  
Vol 15 (8) ◽  
pp. 4215-4224 ◽  
Author(s):  
G. E. Nedoluha ◽  
D. E. Siskind ◽  
A. Lambert ◽  
C. Boone
Keyword(s):  
Atmospheric Chemistry ◽  
Concomitant Increase ◽  
Using Data ◽  
The Tropics ◽  
Chemistry Experiment ◽  
Long Term Variations ◽  
Halogen Occultation Experiment

Abstract. While global stratospheric O3 has begun to recover, there are localized regions where O3 has decreased since 1991. Specifically, we use measurements from the Halogen Occultation Experiment (HALOE) for the period 1991–2005 and the NASA Aura Microwave Limb Sounder (MLS) for the period 2004–2013 to demonstrate a significant decrease in O3 near ~ 10 hPa in the tropics. O3 in this region is very sensitive to variations in NOy, and the observed decrease can be understood as a spatially localized, yet long-term increase in NOy. In turn, using data from MLS and from the Atmospheric Chemistry Experiment (ACE), we show that the NOy variations are caused by decreases in N2O which are likely linked to long-term variations in dynamics. To illustrate how variations in dynamics can affect N2O and O3, we show that by decreasing the upwelling in the tropics, more of the N2O can photodissociate with a concomitant increase in NOy production (via N2O + O(1D) → 2NO) at 10 hPa. Ultimately, this can cause an O3 decrease of the observed magnitude.

scholarly journals Solar Modulation Effects in Terrestrial Production of Carbon-14

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 133-158 ◽  
Author(s):  
Giuliana Castagnoli ◽  
Devendra Lal
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Carbon 14 ◽  
Cosmic Ray Modulation ◽  
The Earth ◽  
Secular Variations ◽  
Galactic Cosmic Ray ◽  
Long Term Variations

This paper is concerned with the expected deviations in the production rate of natural 14C on the earth due to changes in solar activity. We review the published estimates of the global production rates of 14C due to galactic and solar cosmic ray particles, and present new estimates of the expected secular variations in 14C production, taking into account the latest information available on galactic cosmic ray modulation and long-term variations in solar activity.

scholarly journals Reconstructing the long-term cosmic ray intensity: linear relations do not work

2003 ◽  
Vol 21 (4) ◽  
pp. 863-867 ◽  
Author(s):  
K. Mursula ◽  
I. G. Usoskin ◽  
G. A. Kovaltsov
Keyword(s):  
Cosmic Ray ◽  
Geomagnetism And Paleomagnetism ◽  
Cosmic Ray Intensity ◽  
Linear Relations ◽  
Cosmic Ray Modulation ◽  
Interplanetary Physics ◽  
Long Time ◽  
Time Variations ◽  
Cosmic Ray Flux

Abstract. It was recently suggested (Lockwood, 2001) that the cosmic ray intensity in the neutron monitor energy range is linearly related to the coronal source flux, and can be reconstructed for the last 130 years using the long-term coronal flux estimated earlier. Moreover, Lockwood (2001) reconstructed the coronal flux for the last 500 years using a similar linear relation between the flux and the concentration of cosmogenic 10 Be isotopes in polar ice. Here we show that the applied linear relations are oversimplified and lead to unphysical results on long time scales. In particular, the cosmic ray intensity reconstructed by Lockwood (2001) for the last 130 years has a steep trend which is considerably larger than the trend estimated from observations during the last 65 years. Accordingly, the reconstructed cosmic ray intensity reaches or even exceeds the local interstellar cosmic ray flux around 1900. We argue that these unphysical results obtained when using linear relations are due to the oversimplified approach which does not take into account the complex and essentially nonlinear nature of long-term cosmic ray modulation in the heliosphere. We also compare the long-term cosmic ray intensity based on a linear treatment with the reconstruction based on a recent physical model which predicts a considerably lower cosmic ray intensity around 1900.Key words. Interplanetary physics (cosmic rays; heliopause and solar wind termination) – Geomagnetism and paleomagnetism (time variations, secular and long-term)

scholarly journals Wavelet analysis of long-term variations in neutron monitor, sunspot number and interplanetary magnetic field data

2021 ◽  
pp. 39-42
Author(s):  
Fraser Baird ◽  
Alexander MacKinnon
Keyword(s):  
Magnetic Field ◽  
Field Data ◽  
Solar Magnetic Field ◽  
Cosmic Ray ◽  
Negative Polarity ◽  
Neutron Monitors ◽  
Magnetic Field Data ◽  
First Time ◽  
Long Term Variations

For the first time, based on the experimental data of AMS-02, a three-parameter spectrum of variations of ga - lactic cosmic rays was obtained in the range of rigidity 1- 20 GV, to which neutron monitors are most sensitive. It was found that during the period of negative polarity of the solar magnetic field, a power-law spectrum of va - riations is observed with a strong exponential decay in the region of high rigidity. When the polarity changes to positive at the beginning of the new 24th solar cycle, the spectrum of cosmic ray variations becomes purely po- wer-law. The transition to the experimentally obtained spectrum of variations will make it possible to remove a number of uncertainties and increase the accuracy of the analysis of data from the ground network of detectors. This will make it possible to retrospectively obtain fluxes of galactic protons with an average monthly resolution for the period of the space era based on ground-based monitoring.

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