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THe image also clearly shows the lake and the poles rising upward,
Level surface is the continuous surface parallel to the mean spheroid of the earth.
theconstructor.org...
The RIM-162 Evolved SeaSparrow Missile (ESSM)
en.m.wikipedia.org...
The original Sea Sparrow was an expedient design intended to provide short-range defensive fire in a system that could be deployed as rapidly as possible. The AIM-7 Sparrow was the simplest solution as its radar guidance allowed it to be fired head-on at targets and this guidance was easily provided by mounting an aircraft radar on a trainable platform. In the years after its introduction, it was upgraded to follow improvements being made in the air-to-air Sparrow models used by the US Navy and US Air Force. The ultimate version in this line of weapons was the R model, which introduced a new dual-seeker homing system and many other upgrades. After that point, the AIM-120 AMRAAM offered higher performance from a missile that was smaller and lighter, and development of the Sparrow ended in the 1990s.
This left only the Sea Sparrow using the basic platform, and it no longer had to fit on aircraft. So instead of simply using the P and R models as they were, it was decided to dramatically upgrade the weapon as the Evolved Sea Sparrow. The ESSM emerged as a completely new weapon, common only in name with the original, although using all of the same support equipment allowing it to be fit to ships already mounting the older models. Compared to the Sea Sparrow, ESSM has a larger, more powerful rocket motor for increased range and agility, as well as upgraded aerodynamics using strakes and skid-to-turn. In addition, ESSM takes advantage of the latest missile guidance technology, with different versions for Aegis/AN/SPY-1, Sewaco/Active Phased Array Radar (APAR), and traditional target illumination all-the-way.
In the 2000s the NATO Seasparrow Project Office began planning an upgraded Block 2 version of the ESSM. In 2014 Canada pledged 200M CAD to underwrite their share of the Block 2's development cost.[8] ESSM Block 2 leverages the existing Block 1 rocket motor and features a dual-mode X band seeker, increased maneuverability, and other enhancements. Block 2 features enhanced communications systems that allow for mid-course guidance correction, which makes the missiles easy to network into the Navy's emerging Cooperative Engagement Capability.[9] Unlike Block 1, Block 2's active radar homing seeker will support terminal engagement without the launch ship's target illumination radars. The upgraded blast-fragmentation warhead was designed, developed and is being produced by Roketsan. The improved ESSM Block II will be fielded by the US Navy from 2020.[10][11]
Over-the-horizon radar
en.m.wikipedia.org...
The frequency of radio waves used by most radars, in the form of microwaves, travel in straight lines. This generally limits the detection range of radar systems to objects on their horizon (generally referred to as "line of sight" since the aircraft must be at least theoretically visible to a person at the location and elevation of the radar transmitter) due to the curvature of the Earth. For example, a radar mounted on top of a 10 m (33 ft) mast has a range to the horizon of about 13 kilometres (8.1 mi), taking into account atmospheric refraction effects. If the target is above the surface, this range will be increased accordingly, so a target 10 m (33 ft) high can be detected by the same radar at 26 km (16 mi). Siting the antenna on a high mountain can increase the range somewhat; but, in general, it is impractical to build radar systems with line-of-sight ranges beyond a few hundred kilometres.[1]
OTH radars use various techniques to see beyond that limit. Two techniques are most commonly used; shortwave systems that refract their signals off the ionosphere for very long-range detection,[1] and surface wave systems, which use low frequency radio waves[2] that, due to diffraction, follow the curvature of the Earth to reach beyond the horizon. These systems achieve detection ranges of the order of a hundred kilometres from small, conventional radar installations. They can scan a series of high frequencies using a chirp transmitter.
TONGA VOLCANO ERUPTION SHOCK WAVES DETECTED IN CHICAGO
abc7chicago.com...
"The eruption was so powerful that the waves actually propagated all the way around the globe and then back again," meteorologist Gino Izzi said.