分类： 天文学 >> 天文学 提交时间： 2023-02-19
Alexei A. Pevtsov
T. Woods
V. Martinez-Pillet
D. Hassler
T. Berger
S. Gosain
T. Hoeksema
A. R. Jones
R. Kohnert
T. Y. Chen
L. Upton
A. Pulkkinen
摘要： This White Paper argues for the urgent need for the multi-vantage/multi-point observations of the Sun and the heliosphere in the framework of six (6) key science objectives. We further emphasize the critical importance of 5D-``space'': three spatial, one temporal and the magnetic field components. The importance of such observations cannot be overstated both for scientific research and the operational space weather forecast.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Alexei A. Pevtsov
V. Martinez-Pillet
H. Gilbert
A. G. de Wijn
M. Roth
S. Gosain
L. A. Upton
Y. Katsukawa
J. Burkepile
Jie Zhang
K. P. Reardon
L. Bertello
K. Jain
S. C. Tripathy
K. D. Leka
摘要： Long-term synoptic observations of the Sun are critical for advancing our understanding of Sun as an astrophysical object, understanding the solar irradiance and its role in solar-terrestrial climate, for developing predictive capabilities of solar eruptive phenomena and their impact on our home planet, and heliosphere in general, and as a data provider for the operational space weather forecast. We advocate for the development of a ground-based network of instruments provisionally called ngGONG to maintain critical observing capabilities for synoptic research in solar physics and for the operational space weather forecast.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Nishtha Sachdeva
Ward B Manchester
Igor Sokolov
Zhenguang Huang
Alexander Pevtsov
Luca Bertello
Alexei A. Pevtsov
Gabor Toth
Bart van der Holst
摘要： We explore model performance for the Alfven Wave Solar atmosphere Model (AWSoM) with near-real-time (NRT) synoptic maps of the photospheric vector magnetic field. These maps, produced by assimilating data from the Helioseismic Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO), use a different method developed at the National Solar Observatory (NSO) to provide a near contemporaneous source of data to drive numerical models. Here, we apply these NSO-HMI-NRT maps to simulate three Carrington rotations (CRs): 2107-2108 (centered on 2011/03/07 20:12 CME event), 2123 (integer CR) and 2218--2219 (centered on 2019/07/2 solar eclipse), which together cover a wide range of activity level for solar cycle 24. We show simulation results, which reproduce both extreme ultraviolet emission (EUV) from the low corona while simultaneously matching in situ observations at 1 au as well as quantify the total unsigned open magnetic flux from these maps.
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