An Empirical Model of a Polar Coronal Hole at Solar Minimum

1999 ◽  
Vol 511 (1) ◽  
pp. 481-501 ◽  
Author(s):  
S. R. Cranmer ◽  
J. L. Kohl ◽  
G. Noci ◽  
E. Antonucci ◽  
G. Tondello ◽  
...  
Keyword(s):  
Coronal Hole ◽  
Empirical Model ◽  
Solar Minimum ◽  
Polar Coronal Hole

scholarly journals PROPERTIES OF A POLAR CORONAL HOLE DURING THE SOLAR MINIMUM IN 2007

2010 ◽  
Vol 725 (1) ◽  
pp. 774-786 ◽  
Author(s):  
M. Hahn ◽  
P. Bryans ◽  
E. Landi ◽  
M. P. Miralles ◽  
D. W. Savin
Keyword(s):  
Coronal Hole ◽  
Solar Minimum ◽  
Polar Coronal Hole

The Martian ionosphere at solar minimum: Empirical model validation using MAVEN ROSE data

Icarus ◽  
2021 ◽  
pp. 114609
Author(s):  
Sophie R. Phillips ◽  
Clara Narvaez ◽  
František Němec ◽  
Paul Withers ◽  
Marianna Felici ◽  
...  
Keyword(s):  
Model Validation ◽  
Empirical Model ◽  
Solar Minimum ◽  
Martian Ionosphere

Lyman α intensities in a polar coronal hole from a 2D model

2002 ◽  
Vol 30 (3) ◽  
pp. 523-528
Author(s):  
L. Zangrilli ◽  
G. Poletto ◽  
P. Nicolosi ◽  
G. Noci
Keyword(s):  
Coronal Hole ◽  
Polar Coronal Hole ◽  
2D Model

MHD waves in the solar north polar coronal hole

2010 ◽  
Vol 331 (7) ◽  
pp. 716-724 ◽  
Author(s):  
E. Devlen ◽  
E.R. Pekünlü
Keyword(s):  
Coronal Hole ◽  
Polar Coronal Hole ◽  
Mhd Waves ◽  
North Polar

scholarly journals An empirical model (CH-Therm-2018) of the thermospheric mass density derived from CHAMP

2018 ◽  
Author(s):  
Chao Xiong ◽  
Hermann Lühr ◽  
Michael Schmidt ◽  
Mathis Bloßfeld ◽  
Sergei Rudenko
Keyword(s):  
Empirical Model ◽  
Solar Minimum ◽  
Mass Density ◽  
Precise Orbit Determination ◽  
Wave Pattern ◽  
Magnetic Activity ◽  
Low Earth Orbit ◽  
Naval Research ◽  
Champ Satellite ◽  
Incoherent Scatter

Abstract. Thermospheric drag is the major non-gravitational perturbation acting on Low Earth Orbit (LEO) satellites at altitudes up to 1000 km. The drag depends on the thermospheric density, which is a key parameter in the planning of LEO missions, e.g. their lifetime, collision avoidance, precise orbit determination, as well as orbit and re-entry prediction. In this study, we present an empirical model, named CH-Therm-2018, of the thermospheric mass density derived from 9-year (from August 2000 to July 2009) accelerometer measurements at altitude from 460 to 310 km, from the CHAllenging Minisatellite Payload (CHAMP) satellite. The CHAMP dataset is divided into two 5-year periods with 1-year overlap (from August 2000 to July 2005 and from August 2004 to July 2009), to represent the high-to-moderate and moderate-to-low solar activity conditions, respectively. The CH-Therm-2018 model is a function of seven key parameters, including the height, solar flux index, season (day of year), magnetic local time, geographic latitude and longitude, as well as magnetic activity represented by the solar wind merging electric field. Predictions of the CH-Therm-2018 model agree well with the CHAMP observations (disagreements within ±20 %), and show different features of thermospheric mass density during solar activities, e.g. the March-September equinox asymmetry and the longitudinal wave pattern. We compare the CH-Therm-2018 predictions with the Naval Research Laboratory Mass Spectrometer Incoherent Scatter Radar Extended (NRLMSISE-00) model. The result shows that CH-Therm-2018 better predicts the density evolution during the last solar minimum (2008-2009) than the NRLMSISE-00 model. By comparing the Satellite Laser Ranging (SLR) observations of the ANDE-Pollux satellites during August-September 2009, we estimate 6-h scaling factors of thermospheric mass density and obtain a median value of 1.27 ± 0.60, indicating that our model, on average, slightly underestimates the thermospheric mass density at solar minimum.

Observations of Doppler Shifts in a Solar Polar Coronal Hole

1997 ◽  
Vol 490 (2) ◽  
pp. L187-L190 ◽  
Author(s):  
H. P. Warren ◽  
J. T. Mariska ◽  
K. Wilhelm
Keyword(s):  
Coronal Hole ◽  
Polar Coronal Hole ◽  
Doppler Shifts

Study of the June 30, 1973 trans-polar coronal hole

Solar Physics ◽  
1977 ◽  
Vol 51 (2) ◽  
pp. 399-407 ◽  
Author(s):  
Serge Koutchmy
Keyword(s):  
Coronal Hole ◽  
Polar Coronal Hole

Polar Coronal Hole Evolution 2006–2009: Effects At Voyagers 1∕2 In The Heliosheath

2010 ◽  
Author(s):  
E. C. Roelof ◽  
R. B. Decker ◽  
S. M. Krimigis ◽  
M. Maksimovic ◽  
K. Issautier ◽  
...  
Keyword(s):  
Coronal Hole ◽  
Polar Coronal Hole
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